GRAND ISLAND, Neb. (AP) — A 27-year-old Grand Island woman has been charged with child sex assault and incest after police say she had sexual relationship with her teenage stepson.

The woman was in Hall County Court on Friday for the charges.

The Associated Press is not naming the woman to protect the identity of her stepson.

Police say the boy was 15 when his stepmother began having sex with him. Investigators say the boy’s father called police to report he had seen his wife having sex with the boy.

The woman’s preliminary hearing was set for Sept. 11. She faces up to life in prison if convicted of the charges.