Sec. 1.4. (a) Except as provided in subsection (b), a court, in making a determination under section 1.2(e) of this chapter, shall consider all relevant evidence, but may not base its determination solely on a finding that a:
(1) petitioner for adoption would be a better parent for a child than the parent who filed the motion to contest the adoption; or
(2) parent has a biological link to the child sought to be adopted.
(b) If a petition for adoption alleges that a parent's consent to the adoption is unnecessary under IC 31-19-9-8(a)(1) or IC 31-19-9-8(a)(2) and the parent files a motion to contest the adoption under section 1 of this chapter, the court may consider:
(1) the parent's substance abuse;
(2) the parent's voluntary unemployment; or
(3) instability of the parent's household caused by a family or household member of the parent;
as justifiable cause for the parent's abandonment or desertion of the child as described in IC 31-19-9-8(a)(1), failure to communicate significantly with the child as described in IC 31-19-9-8(a)(2)(A), or failure to provide for the care and support of the child as described in IC 31-19-9-8(a)(2)(B), if the parent has made substantial and continuing progress in remedying the factors in subdivisions (1), (2), and (3), and it appears reasonably likely that progress will continue.