Pennsylvania Statutes Title 23 Pa.C.S.A. Domestic Relations § 3304. Grounds for annulment of void marriages

(1) Where either party at the time of such marriage had an existing spouse and the former marriage had not been annulled nor had there been a divorce except where that party had obtained a decree of presumed death of the former spouse.

(2) Where the parties to such marriage are related within the degrees of consanguinity prohibited by section 1304(e) (relating to restrictions on issuance of license).

(3) Where either party to such marriage was incapable of consenting by reason of insanity or serious mental disorder or otherwise lacked capacity to consent or did not intend to consent to the marriage.

(4) Where either party to a purported common-law marriage was under 18 years of age.