Mississippi Code Title 93. Domestic Relations § 93-1-1

(1) The son shall not marry his grandmother, his mother, or his stepmother; the brother his sister; the father his daughter, or his legally adopted daughter, or his grand-daughter; the son shall not marry the daughter of his father begotten of his stepmother, or his aunt, being his father's or mother's sister, nor shall the children of brother or sister, or brothers and sisters intermarry being first cousins by blood. The father shall not marry his son's widow; a man shall not marry his wife's daughter, or his wife's daughter's daughter, or his wife's son's daughter, or the daughter of his brother or sister; and the like prohibition shall extend to females in the same degrees. All marriages prohibited by this subsection are incestuous and void.

(2) Any marriage between persons of the same gender is prohibited and null and void from the beginning. Any marriage between persons of the same gender that is valid in another jurisdiction does not constitute a legal or valid marriage in Mississippi.