Kitchens was arrested on September 7 and her son, from Weaverville, north of Asheville, was arrested a day later. According to arrest documents, the mother and son had sex in August.
Pfeiffer, who is self-employed, also faces charges of indecent liberties with a child, communicating threats and being intoxicated and disruptive. His Facebook page shows that that he is the father of a toddler son.
Pfeiffer appears to live with both his mother and his wife Shannon Roman in Asheville.
He appears to have posted a picture of his mother online as recently as last month. It is unclear what Kitchens' marital status is.
It is also unclear how the allegations came to light.