The family court, by a decree of nullity, may declare void the marriage contract for any of the following causes, existing at the time of the marriage:
(1) That the parties stood in relation to each other of ancestor and descendant of any degree whatsoever, siblings of the half as well as the whole blood, a person and the child of the person's biological sibling, whether the relationship is the result of the issue of parents married or not married to each other;
(2) That the parties, or either of them, had not attained the legal age of marriage;
(3) That one of the parties had an undivorced spouse living;
(4) That one of the parties lacked the mental capacity to consent to the marriage;
(5) That consent to the marriage of the party applying for annulment was obtained by force, duress, or fraud, and there has been no subsequent cohabitation; and
(6) That one of the parties was a sufferer of or afflicted with any loathsome disease and the fact was concealed from, and unknown to, the party applying for annulment.