When the validity of a marriage shall be denied or doubted by either of the parties, the other may institute a suit for affirming the marriage and, upon due proof of the validity thereof, it shall be decreed to be valid and such decree shall be conclusive upon all persons concerned.
Affirmation of marriage if validity has been denied or doubted
S.C. Code Ann. § 20-1-520, under Title 20, Chapter 1.
S.C. Code Ann. § 20-1-520