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Prosecutors in central Nebraska have charged a 21-year-old woman and a 39-year-old man with incest after Grand Island police say the father and daughter had sex in September, according to court records.

Samantha H. Kershner and Travis Fieldgrove face incest charges in Hall and Adams counties, according to court records.

Grand Island police began investigating the relationship between the St. Paul residents on Sept. 18 after Kershner's mother alleged they were in an illegal relationship, according to an affidavit for their arrests.

Investigators believe Kershner didn't grow up with Fieldgrove and three years ago learned he was her father, police said in the affidavit.

Contacted by Grand Island police in September, Fieldgrove denied to investigators that he was Kershner's father.

But DNA testing completed Jan. 14 determined there was a 99.99 percent probability of his paternity, according to an arrest affidavit for the duo in Adams County.

They face incest charges there because Hastings police allege they married at the Adams County Courthouse in Hastings Oct. 1.