Sec. 4. A marriage is void if either party to the marriage was mentally incompetent when the marriage was solemnized. [Pre-1997 Recodification Citation: 31-7-6-4.] As added by P.L.1-1997, SEC.3.
Mentally incompetent persons
Ind. Code § 31-11-8-4, under Void Marriages.
Ind. Code § 31-11-8-4