¶1In these two child custody disputes, the maternal grandparents challenge the trial court’s award of custody to the noncustodial father. The trial courts found in both cases that it would be in the best interest of each child to remain with his grandparents, but struck down the “best-interest-of-the-child” standard in OCGA § 19-7-1 (b.l) as unconstitutional. We granted the grandparents’ discretionary applications to determine whether the best-interest-of-the-child standard is constitutional in custody disputes between a parent and a third party. Considering the fundamental rights of parents, we construe the custody statute as requiring the third party to show by clear and convincing evidence thát parental custody would harm the *588child in order to rebut the statutory presumption in favor of the parent. With that narrowing construction, we uphold as constitutional the best interest standard when applied to custody disputes between a biological parent and custodial third party under OCGA § 19-7-1 (b.l). Therefore, we reverse and remand.
¶2I. FACTS AND PROCEEDINGS
¶3Both of these appeals concern a custody dispute between a single, noncustodial parent and relatives who have physical custody of the child. Thus, these cases do not involve the removal of a child from the parent’s home, but rather the possible reunification of parent and child.
¶4S00A1610. Clark v. Wade.
¶5Warren Wade was born in 1994 to Melissa Wright and Douglas Wade and has lived with his maternal grandparents, Margie and James Clark, since 1995. When Warren’s parents divorced in 1996, his mother was awarded custody. She left him to be raised by his grandparents, who were already raising his older brother, and Warren’s father exercised regular visitation rights. In 1999, Melissa Wright was arrested for a drug violation, and Douglas Wade sought custody of their five-year-old child. The trial court awarded him temporary custody, and the grandparents moved to intervene in the custody proceeding. The trial court found that it would be in the best interest of the child to remain in the custody of the grandparents, but struck down the best interest standard in OCGA § 19-7-1 (b.l) as “constitutionally insufficient” and awarded custody to the father. This Court granted the grandparents’ application to appeal to consider whether the statute was unconstitutional under our ruling in Brooks v. Parkerson
¶6S00A2014. Driver v. Raines.
¶7Justin Casey Veal was born in 1992 and is the child of-Dawn Driver and John Raines, who never married. The child has lived with his mother and maternal grandparents most of his life. The state sought child support from the father in 1995; the father filed a peti*589tion for legitimation in 1996; and Justin lived with his father from June 1996 to January 1997. When Justin returned home to his mother and grandparents, he complained about his arm and doctors determined that it had been broken for a week. The father filed a petition for custody, and the maternal grandparents intervened. In response to the father’s constitutional challenge, the trial court ruled that § 19-7-1 (b.l) failed to articulate any standard and allowed the factfinder to substitute its subjective judgment about the child’s best interest for the parent’s decision, thus depriving parents of their liberty and privacy interests in the care, custody, and management of their children. Accordingly, the trial court held that the statute was unconstitutional and awarded custody to the father. This Court granted the grandparents’ application and consolidated their appeal with Clark v. Wade.
¶8II. STATUTORY CONSTRUCTION
¶9OCGA § 19-7-1 (b.l) governs custody disputes between a biological parent and a limited number of third parties who are related to the child. They include a grandparent, aunt or uncle, great aunt or uncle, sibling, or adoptive parent. The statute provides that a parent may lose custody if a trial court determines that the best interest of the child supports an award of custody to the third party. There is a presumption that it is in the child’s best interest to remain in the custody of the parent, but the third party may rebut that presumption. The statute provides:
[I]n any action involving the custody of a child between the parents or either parent and a third party limited to grandparent, great-grandparent, aunt, uncle, great aunt, great uncle, sibling, or adoptive parent, parental power may be lost by the parent, parents, or any other person if the court hearing the issue of custody, in the exercise of its sound discretion and taking into consideration all the circumstances of the case, determines that an award of custody to such third party is for the best interest of the child or children and will best promote their welfare and happiness. There shall be a rebut-table presumption that it is in the best interest of the child or children for custody to be awarded to the parent or parents of such child or children, but this presumption may be overcome by a showing that an award of custody to such third party is in the best interest of the child or children. The sole issue for determination in any such case shall be what is in the best interest of the child or children.3
¶10*590Enacted in 1996, this statute adopts the same standard — best interest of the child — for custody disputes between a parent and third party as applies in custody disputes between two parents
¶11Parental Rights and Fitness Standards
¶12In construing statutes, we must consider the legislative intent, keeping in mind “the old law, the evil, and the remedy.”
¶13Under the parental rights standard, a third party could gain custody in a dispute with a parent only by proving by clear and convincing evidence that the parent had lost his or her parental power.
¶14Strict adherence to the parental rights standard sometimes resulted in unjust decisions that ignored the health and welfare of the child. For example, this Court reversed an award of custody to a stepfather with whom the child had lived and ruled instead that the *591biological father was entitled to custody after the mother’s death, despite his having provided no financial support or sought any visitation with his daughter in the seven years since his divorce from the mother.
¶15Because of the harshness of the parental rights standard, this Court adopted a second standard by which a parent could lose custody in exceptional circumstances.
A finding of unfitness must center on the parent alone, that is, can the parent provide for the child sufficiently so that the government is not forced to step in and separate the child from the parent. A court is not allowed to terminate a parent’s natural right because it has determined that the child might have better financial, educational, or even moral advantages elsewhere. Only under compelling circumstances found to exist by clear and convincing proof may a court sever the parent-child custodial relationship.19
¶16*592Although this standard appears fair on its face, its application has caused unfair results because of its reliance on biological connections to the exclusion of other important considerations.
¶17Just as this Court adopted the fitness standard to ameliorate the undesirable consequences of the parental rights standard, we have on occasion rejected or ignored the fitness standard based on “exceptional circumstances.”
¶19In enacting OCGA § 19-7-1 (b.l), the legislature changed the law governing parent-third party custody disputes and added an additional way by which parental power could be lost.
¶20What has not changed under the new standard are three presumptions: (1) the parent is a fit person entitled to custody, (2) a fit parent acts in the best interest of his or her child, and (3) the child’s best interest is to be in the custody of a parent.
¶21III. CONSTITUTIONALITY OF BEST INTEREST STANDARD
¶22In considering the constitutionality of the Georgia statute on parent-third party custody disputes, there are two relevant lines of cases. One involves the termination of parental rights, which have usually required a showing of parental unfitness before ending the parent-child relationship.
¶23Termination of Parental Rights
¶24The Fourteenth Amendment of the United States Constitution provides that no state shall "deprive any person of life, liberty, or property, without due process of law.” The United States Supreme Court has recognized that parents have a fundamental liberty interest in the care, custody, and management of their children.
¶25In cases dealing with the rights of unwed fathers, however, the Court refused to adopt unfitness as the sole standard for enforcing a biological father’s due process rights, instead distinguishing between a developed parent-child relationship and a potential relationship. For example, the Court in Stanley v. Illinois
¶26In Quilloin v. Walcott,
¶27Unlike the parental termination cases, third-party custody cases *595do not sever the relationship between parent and child. Instead, the parent retains significant rights, including the right to visitation and to obtain custody under changed circumstances.
¶28Grandparent Visitation Cases
¶29In the second line of cases, this Court held in Brooks v. Parkerson that our state grandparents’ visitation statute was unconstitutional under both the Georgia Constitution and United States Constitution because it failed to require a showing of harm before visitation could be ordered.
¶30The Supreme Court’s decision last term in Troxel v. Granville
¶31Because the Court based its decision on the sweeping breadth of the statute and the trial court’s application of the statute’s unlimited power, it did not decide whether due process required all grandparent visitation statutes to include a showing of harm as a condition precedent to granting visitation.
¶32Unlike the grandparent visitation cases, however, the custody cases in this appeal do not involve a third party seeking to intrude upon an established parent-child custodial relationship. Instead, they involve a biological parent seeking to gain custody from a third party who has been responsible for the daily care of the child and already has established a family unit for the child. Thus, the relationship among the parent, child, and third-party relative differs in these custody cases from the relationship among the parties in Troxel and other grandparent visitation cases. Applying the Court’s distinction in the unwed father cases, more than a biological link exists between the child and noncustodial father, but the relationship does not rise to the level of a daily association.
¶33IV. CONSTITUTIONALITY OF OCGA § 19-7-1 (b.l)
¶34Parents have a constitutional right under the United States and Georgia Constitutions to the care and custody of their children. This right to the custody and control of one’s child is “a fiercely guarded right. . . that should be infringed upon only under the most compel*597ling circumstances.”
¶35Aligned against the parents’ constitutional right is the child’s constitutional right to protection of his or her person
[Although] in most instances it will be found that the legal right of the parent and the interest of the child are the same[, i]f through misconduct or other circumstances it appears that the case is exceptional, and that the welfare of the child requires that it should be separated even from its parent, the parens patriae must protect the helpless and the innocent.53
¶36Relying on this doctrine, we have upheld the constitutionality of laws that terminated the parental rights of mentally deficient parents who were incapable of caring for their children
¶37In enacting the parent-third party custody statute, the Georgia General Assembly avoided the constitutional defects that the U. S. Supreme Court plurality found in the Washington visitation statute. First, OCGA § 19-7-1 (b.l) expressly limits third parties who may seek custody to a specific fist of the child’s closest relatives, including an adoptive parent. Second, the statute defers to the fit parent’s decision on custody by establishing a rebuttable presumption in favor of parental custody. What is left open for judicial interpretation is how to determine that an award of custody to the third party “is for the best interest of the child or children and will best promote their welfare and happiness.”
¶38*598Construing the Best Interest Standard
¶39Our judicial responsibility requires us to consider the legislature’s intent in enacting the law and to construe the statute to give effect to that intent when possible. This role means that we must give a narrowing construction to a statute when possible to save it from constitutional challenge.
¶40Applying a narrowing construction that is consistent with both the legislature’s intent and Brooks v. Parkerson, we interpret the “best-interest-of-the-child” standard in OCGA § 19-7-1 (b.l) as requiring the third party to show that parental custody would harm the child to rebut the statutory presumption in favor of the parent. Once this presumption is overcome, the third party must show that an award of custody to him or her will best promote the child’s health, welfare, and happiness.
¶41By harm, we mean either physical harm or significant, long-term emotional harm; we do not mean merely social or economic disadvantages.
¶42In considering the issues of harm and custody, trial courts should consider a variety of factors that go beyond the parent’s biological connection or present fitness to encompass the child’s own needs. These factors should include:
(1) who are the past and present caretakers of the child;58
(2) with whom has the child formed psychological bonds and how strong are those bonds;59
(3) have the competing parties evidenced interest in, and contact with, the child over time;60 and
(4) does the child have unique medical or psychological *599needs that one party is better able to meet.61
¶43An analysis of these factors, keeping in mind the statutory presumption of parental custody, will enable courts to award custody to a third-party relative only when a real threat of harm would result from parental custody.
¶44Standard of Proof
¶45Normally, “the degree of proof required in a particular type of proceeding is the kind of question which has traditionally been left to the judiciary to resolve.”
¶46V. CONCLUSION
¶47In conclusion, we interpret the best interest standard in the parent-third party custody statute to mean that the third party must prove by clear and convincing evidence that the child will suffer physical or emotional harm if custody were awarded to the biological parent. Once this showing is made, the third party must then show that an award of custody to him or her will best promote the child’s welfare and happiness. With that construction of the statute, we uphold the best-interest-of-the-child standard as constitutional when applied to custody disputes between a noncustodial parent and third party under OCGA § 19-7-1 (b.l).
¶48Judgments reversed and cases remanded.
¶49 Cf. Wade v. Wade, 272 Ga. 526 (531 SE2d 103) (2000) (reversing award of custody in divorce action to paternal grandmother when custody dispute was between fit mother and father). See generally Carolyn Wilkes Kaas, Breaking Up a Family or Putting It Back Together Again: Refining the Preference in Favor of the Parent in Third-Party Custody Cases, 37 WM. & Maky L. rev. 1045 (1996).
¶50265 Ga. 189 (454 SE2d 769) (1995).
¶51 OCGA § 19-7-1 (b.1) (1999).
¶52 See OCGA § 19-9-3 (a) (2) (1999); Carvalho v. Lewis, 247 Ga. 94, 95 (274 SE2d 471) (1981); Gazaway v. Brackett, 241 Ga. 127, 128 (244 SE2d 238) (1978); see also Ivey v. Ivey, 264 Ga. 435, 437 (445 SE2d 258) (1994) (in divorce, no preference for biological parent when custody dispute is between biological parent and adoptive parent).
¶53 See Stills v. Johnson, 272 Ga. 645, 650 (533 SE2d 695) (2000).
¶54 OCGA § 1-3-1 (a) (1990).
¶55 See Childs v. Childs, 237 Ga. 177 (227 SE2d 49) (1976).
¶56 See White v. Bryan, 236 Ga. 349 (223 SE2d 710) (1976) (affirming award of custody of four-year-old daughter to stepfather after death of mother based on evidence that natural father was unfit).
¶57 See In re Baby Girl Eason, 257 Ga. 292 (358 SE2d 459) (1987) (adopting fitness standard to determine right of unwed father to legitimate child whom mother placed for adoption).
¶58 See Childs, 237 Ga. at 178.
¶59 See Miele v. Gregory, 248 Ga. 93, 94 & n. 1 (281 SE2d 565) (1981).
¶60 See OCGA §§ 19-7-1 (b), 19-7-4; Waldrup v. Crane, 203 Ga. 388 (46 SE2d 919) (1948); see generally Dan E. McConaughey, Georgia Divorce, Alimony and Child Custody, §§ 24-7 to 24-11 (25th ed. 1999).
¶61 See Howell v. Gossett, 234 Ga. 145, 146-147 (214 SE2d 882) (1975); see also Chapin v. Cummings, 191 Ga. 408 (12 SE2d 312) (1940) (removing ten-year-old child from home of stepfather who had raised child from infancy and awarding custody based on father’s prima facie right to custody on mother’s death).
¶63 McConaughey, Georgia Divorce § 24-8.1, at 487; see, e.g., Rawdin v. Conner, 210 Ga. 508, 511 (81 SE2d 461) (1954) (refusing to find a definite contract because details were lacking about how grandparents were to rear and educate child).
¶64 See Perkins v. Courson, 219 Ga. 611, 623 (135 SE2d 388) (1964) (holding that third party could challenge parent’s legal right to custody on grounds of unfitness).
¶65 See Blackburn v. Blackburn, 249 Ga. 689, 692 (292 SE2d 821) (1982).
¶66 See Carvalho, 247 Ga. at 95.
¶68 See Knox v. Knox, 226 Ga. 619, 620 (176 SE2d 712) (1970) (custody of nine-year-old daughter cannot be granted to adult stepbrother merely because noncustodial father has not maintained a close relationship with his daughter); Peck v. Shierling, 222 Ga. 60 (148 SE2d 491) (1966) (reversing award of custody of 11-year-old boy to paternal aunt and uncle with whom he had lived for two years and to whom father had given custody because they failed to prove mother was unfit).
¶69 See Howell, 234 Ga. at 146-147; cf. Ghrist v. Fricks, 219 Ga. App. 415, 420 (465 SE2d 501) (1995) (“we have held time and time again that the court must consider the best interest and welfare of the child before granting a legitimation petition, and that it is not bound by the desires and contentions of the biological parents”).
¶70 See Triplett v. Elder, 234 Ga. 243, 244-245 (215 SE2d 247) (1975) (trial court did not abuse its discretion in finding that best interests of children would be served by remaining together in custody of paternal grandmother who had cared for them for nine years after father’s death); Williams v. Ferrell, 231 Ga. 470 (202 SE2d 427) (1973) (trial court did not abuse its discretion by finding “in effect” that fit mother had lost her right to custody of 15-year-old child who had leukemia and had lived with paternal grandmother, except for occasional visits with mother, since she was 13 months of age).
¶71 See Wade, 272 Ga. at 527 (trial court’s finding of mother’s unfitness based solely on her involvement with a man other than her husband during the couple’s separation); Blackburn, 249 Ga. at 689 (trial court’s finding of mother’s unfitness based, in part, on her giving birth to an illegitimate, racially mixed child); Bennett v. Clemens, 230 Ga. 317, 319 (196 SE2d 842) (1973) (trial court awarded custody of nine-year-old to paternal grandparents, despite father’s objections, based on mother’s working for underground newspapers, being placed on probation for possession of marijuana, leaving child with four female friends to attend her mother’s funeral, engaging in sexual acts with men and women, and teaching child about “the gay life”).
¶72 See In re B. D. C., 256 Ga. 511, 512 (350 SE2d 444) (1986); Blackburn, 249 Ga. at 694.
¶73 See 1996 Ga. Laws 412.
¶74 See generally Conrad D. Brooks, Peach Sheet, Parent and Child Relationship Generally: Provide a Standard for Loss of Parental Power, 13 Ga. St. U. L. Rev. 155 (1996).
¶75 See Thorne v. Padgett, 259 Ga. 650, 651 (386 SE2d 155) (1989); see also Baby Girl Eason, 257 Ga. at 297 (adopting a fitness standard to evaluate unwed father’s right to legitimate his biological child when he has not abandoned his “opportunity to develop a relationship”).
¶76 See Troxel v. Granville, 530 U. S. 57 (120 SC 2054, 2060, 147 LE2d 49) (2000).
¶77 See Pierce v. Society of Sisters, 268 U. S. 510 (45 SC 571, 69 LE 1070) (1925); Meyer v. Nebraska, 262 U. S. 390 (43 SC 625, 67 LE 1042) (1923).
¶78 See Santoksy v. Kramer, 455 U. S. 745, 747-748 (102 SC 1388, 71 LE2d 599) (1982).
¶79 See 405 U. S. 645, 649 (92 SC 1208, 31 LE2d 551) (1972).
¶80463 U. S. 248, 260-263 (103 SC 2985, 77 LE2d 614) (1983).
¶81 See id. at 263 (citation omitted).
¶82434 U. S. 246 (98 SC 549, 54 LE2d 511) (1978).
¶83 See id. at 255.
¶84 See Gazaway, 241 Ga. at 128, 129; see also OCGA § 19-9-3 (a) (4) (parent may gain custody when the child turns 14 if the child chooses); Skipper v. Smith, 239 Ga. 854 (238 SE2d 917) (1977) (parent retains right to consent to child’s adoption despite transfer of legal custody to another person).
¶85 See In re Custody of C.C.R.S., 892 P2d 246, 254-255 (Colo. 1995).
¶88 See OCGA § 19-7-3 (c) (1999).
¶90 See Troxel, 120 SC at 2065.
¶91 See id. at 2061.
¶92 See id. at 2062-2063.
¶93 See id. at 2064.
¶94 See id. (citing state supreme court decisions interpreting Maryland and Virginia statutes); id. at 2075 (Kennedy, J., dissenting).
¶95 See also id. at 2070-2071 (Stevens, J., dissenting) (finding no support for state supreme court’s holding that Federal Constitution requires a showing of actual or potential harm before trial court may order visitation over parent’s objections).
¶96 See Lehr, 463 U. S. at 263.
¶97In re Suggs, 249 Ga. 365, 367 (291 SE2d 233) (1982).
¶98 See Brooks, 265 Ga. at 194.
¶99 See 1983 Ga. Const, art. I, sec. I, para. II.
¶100 See In re J. C., 242 Ga. 737, 738 (251 SE2d 299) (1978).
¶101 See id. at 738 (quoting Williams v. Crosby, 118 Ga. 296, 298 (45 SE 282) (1903)).
¶102 See 242 Ga. at 738-739.
¶103Froug v. Harper, 220 Ga. 582, 585 (140 SE2d 844) (1965).
¶104 See Gravely v. Bacon, 263 Ga. 203, 206 (429 SE2d 663) (1993); City of Hapeville v. Anderson, 246 Ga. 786 (272 SE2d 713) (1980).
¶105 See Chapin v. Cummings, 191 Ga. 408 (12 SE2d 312) (1940) (“the ‘paramount interest of the child’ shall not be taken to mean that the court would in any given contest simply determine where the child might have the better financial, educational, or even moral advantages”); see also 1983 Ga. Const, art. I, sec. I, para. XXV (social status of citizen shall never be the subject of legislation).
¶106 See Ortner v. Pritt, 419 SE2d 907 (W. Va. 1992); see generally Carol A. Crocca, Annotation, Continuity of Residence as Factor in Contest Between Parent and Nonparent for Custody of Child Who Has Been Residing with Nonparent - Modern Status, 15 ALR5TH 692 (1993).
¶107 See Comer v. Comer, 300 SE2d 457 (N.C. App. 1983).
¶108 See In re Brandon L.E., 394 SE2d 515 (W. Va. 1990).
¶109 See Triplett, 234 Ga. at 244 (considering need of mentally retarded child for constancy in environment and routines); Williams v. Ferrell, 231 Ga. at 470 (considering emotional and medical needs of child suffering from leukemia).
¶110 See Santoksy, 455 U. S. at 755-756 (citation omitted).
¶111 See id. at 758-761.
¶112 See, e.g., Miele, 248 Ga. at 93-94.
¶113 See Price v. Howard, 484 SE2d 528 (N.C. 1997) (best interest of child test does not offend due process in custody dispute between custodial nonparent and parent when parent’s conduct has been inconsistent with his or her constitutionally protected status as a natural parent).