Ohio family's lawsuit alleges mom's embryo was fertilized with sperm of a stranger

A family is shocked and outraged after a dad found out via an at-home DNA test kit that he is not the biological father of his daughter.
3:17 | 08/08/19

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Transcript for Ohio family's lawsuit alleges mom's embryo was fertilized with sperm of a stranger
We turn to our "Gma" cover really interesting one. An Ohio family suing their fertility clinic claiming a DNA test revealed their 24-year-old daughter is not biologically related to her father. ABC's Stephanie Ramos is here with more on this. Good morning, Stephanie. Reporter: Good morning. The couple in this case says it was an innocent gift. Given to them by their adult daughter Rebecca last Christmas. An at home DNA kit. But the results a month later showed Rebecca's biological father was not the man who How did this happen? How could something like this have happened? Who is she biologically related to? Reporter: DNA tests are designed to show you where you come from but this morning, Joseph and his family are saying a DNA test has thrown their family into turmoil alleing in a new lawsuit the test showed he is not his 24-year-old daughter Rebecca's biological father. They say a subsequent paternity test confirmed it. In the lawsuit the family from Ohio claims a fertility clinic Joseph and his wife Jennifer used in 1994 fertilized his wife's embryo with sperm from a stranger. It never crossed our minds and maybe it should have but we trusted implicitly and maybe even blindly in some ways. Reporter: Now cartellone is suing the clinic. According to the suit the couple we're told their successful pregnancy was a result of Jennifer's eggs and Joseph's sperm but according to the complaint hair daughter's biological father is likely, quote, one of a handful of individuals, one of whom worked at the Christ hospital. Was that shocking? Yes. Very shocking. Very difficult to work through the emotions as you're doing this research and putting the pieces of the muzzle together. And has the fertility clinic or the hospital reached out to any of you? Have they explained how something like this could have happened gentleman. They have not. Reporter: The Christ hospital health network tells ABC news they won't comment on ongoing litigation. The family attorney says this isn't the only time he's heard of a fertility clinic mix-up. Unfortunately I get a call almost every day from somebody who's been the victim of fertility center misconduct. The amount of misconduct is staggering. Reporter: But experts say as an increasing number of people use fertility services, the industry is lacking regulatory oversight. Do you wish you hadn't taken that DNA test? ? There's a difficult question because of all the emotions around this. I think it's better that it's out in the open for us to be able to deal with and maybe some good can come out of it. Reporter: Cartellone wants parents to lone from their ordeal and when you go into a fertility clinic demand trance parent my into is the process and concerned that his sperm may have been used to create embryos with other women's eggs. He may have other children out there and may not even know it. What a crazy world. Good to have you in New York. Good to see you in person. Now to our back to school

This transcript has been automatically generated and may not be 100% accurate.

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