Tenn. Code § 39-15-302 : Criminal Offenses — Offenses Against The Family — Bigamy And Incest —15-302 - Incest TEXT PDF (a) A person commits incest who engages in sexual penetration as defined in § 39-13-501, with a person, knowing the person to be, without regard to legitimacy: (1) The person's natural parent, child, grandparent, grandchild, uncle, aunt, nephew, niece, stepparent, stepchild, adoptive parent, adoptive child; or (2) The person's brother or sister of the whole or half-blood or by adoption. (b) Incest is a Class C felony. T.C.A. § 39-15-302 Acts 1989, ch. 591, § 1; 1990, ch. 1030, § 25.