A grandfather, 55-year-old Mikeal Shane Pruett of Stevensville, Montana, has been sentenced to 200 years in prison after impregnating his 11-year-old granddaughter and sexually assaulting the victim's younger sister.

Pruett, who is reportedly married, was the guardian to both girls when he raped them.

District Judge Jeffrey Langton handed down a sentence of 100 years each for the two counts of incest.

The grandfather was arrested after the 11-year-old girl was found to be 32 weeks pregnant.

According to reports, the girl went to see a doctor after suffering from cramps.‎

She, however, did not know she was pregnant until she was informed by a doctor "because she did not know what it felt like to be pregnant."

When questioned, the child claimed that she had sex with a 14-year-old boy, whose name she did not know, at a county fair.

However, the medical staff noted that the term of pregnancy and the estimated date of conception, were off by three months.

It was only upon further questioning that the girl admitted that her grandfather told her to make up the story and that he was the one sleeping with her and her sister.

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