Marriages void ab initio--In general.
The following marriages are prohibited in the District
of Columbia and shall be absolutely void ab initio, without
being so decreed, and their nullity may be shown in any
collateral proceedings, namely:
(1) The marriage of a man with his grandmother, grandfather's
wife, wife's grandmother, father's sister, mother's sister,
mother, stepmother, wife's mother, daughter, wife's daughter,
son's wife, sister, son's daughter, daughter's daughter,
son's son's wife, daughter's son's wife, wife's son's daughter,
wife's daughter's daughter, brother's daughter, sister's
daughter;
(2) The marriage of a woman with her grandfather, grandmother's
husband, husband's grandfather, father's brother, mother's
brother, father, stepfather, husband's father, son, husband's
son, daughter's husband, brother, son's son, daughter's
son, son's daughter's husband, daughter's daughter's husband,
husband's son's son, husband's daughter's son, brother's
son, sister's son;
(3) The marriage of any persons either of whom has been
previously married and whose previous marriage has not been
terminated by death or a decree of divorce.
(D.C. Statutes section 46-401)
