Several people seeking their biological fathers made unsettling discoveries which have led to a retired fertility doctor being charged with two felonies in Indiana.

Donald J. Cline, 77, a retired fertility doctor living in Zionsville, allegedly lied under oath when being questioned about using his own sperm for artificial inseminations he performed at his clinic in Indianapolis.

The Zionsville, Indiana Times Sentinel reports an investigation in Marion County began when, according to a probable cause affidavit, the county prosecutor’s office received information from a local television news anchor about a woman, known only as “Carrie,” who recently discovered her father was not her biological father. Carrie took a DNA test through 23andMe, a DNA testing website, and found she was related to at least eight other people on the site.

Angela Ganote, an anchor at Fox59 in Indianapolis, interviewed three of Carrie’s apparent siblings and learned that each of their mothers — like Carrie’s — had gone to the same clinic for insemination.

The affidavit states that Carrie contacted Cline, and he told her he used sperm from a resident or medical student, whose sperm was not to be used for more than three successful pregnancies, which was the same thing Cline had told Carrie’s mother in the early 1980s. The time span between the oldest and youngest of the known siblings is eight years, which begged questions about how a medical resident would be available as a donor for that long.

In June, two of Carrie’s siblings spoke to a deputy prosecuting attorney. According to the affidavit, one of the siblings had created a family tree and established that their mothers had all been Cline’s patients. The two siblings sent a Facebook message to Cline’s family and early this year the siblings met with Cline’s children. In that meeting, Cline’s children said their dad had admitted donating his own sperm to a sperm bank and that he hadn’t done it more than eight times. Cline’s son asked Cline about several inconsistencies, and Cline then changed his story and admitted to providing his sperm over the course of seven years and that he did have children “out there.”

The case is sparking calls for changes in Indiana state laws to better regulate fertility clinics.

“I think this is something Indiana needs to take a look at,” State Sen. Jim Merritt told WXIN-TV. “It’s very concerning, and it’s a health issue.”

Cline’s case is not the first revelation in recent years involving a fertility doctor using his own sperm to impregnate patients without their knowledge. In 1998, reports said that Cecil Jacobson may have fathered as many as 70 children over a 20-year period in Virginia. And a Connecticut doctor, Ben Ramaley, settled a lawsuit under similar circumstances in 2009.

The Zionsville, Indiana Times Sentinel contributed to this story.