A Mills woman is heading to prison after admitting that she was having sexual encounters with a member of her family.

Doris Towner was sentenced to one-and-one half to two years at the Wyoming Women's Center in Lusk, after she pleaded guilty to one charge of incest.

According to the affidavit filed in Natrona County Circuit Court, the investigation began in September 2013, when a Natrona County Sheriff’s Investigator received a report from a counselor, about a girl who had been sexually assaulted by her grandfather, later identified as 53-year old Glenn Towner.

An interview with the other granddaughter revealed that she also had been touched inappropriately.

These repeated contacts started as early as May 2013.

One girl has been placed in protective custody, the other lives out of state.

The granddaughters told investigators that they told 33-year old Robin Keene sometime in September 2013, and also in August 2014, about the sexual contacts with Glenn Towner, but Keene did nothing.

Glenn and Doris Tower married in July 2013, and they have had an open relationship that included many sexual encounters with Keene, according to the affidavit.

At her sentencing, Doris said she plans to divorce Glenn.

Meanwhile, Glenn Towner pleaded guilty to similar charges to this case and has already been sentenced.

Keene has pleaded guilty to charges and is waiting to be sentenced.