Westminster Confession of Faith / Chapter 24 / 4
Chapter 24. Of Marriage, and Divorce — 4
Marriage ought not to be within the degrees of consanguinity or affinity forbidden by the Word. Nor can such incestuous marriages ever be made lawful by any law of man or consent of parties, so as those persons may live together as man and wife. The man may not marry any of his wife’s kindred, nearer in blood than he may of his own: nor the woman of her husband’s kindred, nearer in blood than of her own.
