B. Any person who commits adultery or fornication with his daughter or granddaughter, or with her son or grandson, or her father or his mother, shall be guilty of a Class 5 felony. However, if a parent or grandparent commits adultery or fornication with his or her child or grandchild, and such child or grandchild is at least thirteen years of age but less than eighteen years of age at the time of the offense, such parent or grandparent shall be guilty of a Class 3 felony.
Code 1950, § 18.1-191; 1960, c. 358; 1975, cc. 14, 15; 1981, c. 397; 1993, c. 703; 2014, c. 542.