Md. Code, Family Law § 2–202

(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.