Md. Code, Fam. Law § 2-202 : FAMILY LAW — MARRIAGE — VALID MARRIAGES; VOID MARRIAGES —202 - Marriages within certain degrees of relationship void; penalties TEXT PDF (a) Any marriage performed in this State that is prohibited by this section is void. (b) (1) An individual may not marry the individual's: (i) grandparent; (ii) parent; (iii) child; (iv) sibling; or (v) grandchild. (2) An individual who violates any provision of this subsection is guilty of a misdemeanor and on conviction is subject to a fine of $1,500. (c) (1) An individual may not marry the individual's: (i) grandparent's spouse; (ii) spouse's grandparent; (iii) parent's sibling; (iv) stepparent; (v) spouse's parent; (vi) spouse's child; (vii) child's spouse; (viii) grandchild's spouse; (ix) spouse's grandchild; or (x) sibling's child. (2) An individual who violates any provision of this subsection is guilty of a misdemeanor and on conviction is subject to a fine of $500. Md. Code, FL § 2-202