A person is guilty of incest in the first degree when he or she commits the crime of rape in the first degree, as defined in subdivision three or four of section 130.35 of this part, or criminal sexual act in the first degree, as defined in subdivision three or four of section 130.50 of this part, against a person whom he or she knows to be related to him or her, whether through marriage or not, as an ancestor, descendant, brother or sister of either the whole or half blood, uncle, aunt, nephew or niece.

Incest in the first degree is a class B felony.