A Mills woman is admitting to engaging in sex within the family, and endangering children.

Thirty-three year old Robin Keene has pleaded guilty to one felony charge of incest, and two misdemeanor counts of child endangering.

According to the Natrona County Sheriff's Office, the investigation began in September 2014, when deputies 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 September 2013.

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

The granddaughters told investigators that they told Keene in September and October of 2013, and also in August 2014, about the sexual contacts with Glenn Towner.

Keene then confronted Towner about the contact and also told law enforcement that Towner also touched her and that she was a victim of sexual abuse, however investigators later found text messages sent from Keene to Towner and when questioned, Keene admitted to having a consensual sexual relationship with Towner.

Glenn and 52-year old Doris Towner married in July 2013, and they have had an open relationship that included many sexual encounters with Keene, according to the affidavit.

As part of a plea deal, prosecutors will seek a four-to-seven year suspended prison sentence with six years of probation for the incest charge, and six months in jail for the child endangerment charges

Keene is being held on $50,000 bond, and will be sentenced at a later date.

Both Towner's have pleaded guilty to similar charges connected to this case, and are waiting to be sentenced.