Daily Star's biggest headlines straight to your inbox!A distraught couple is suing an IVF clinic after taking a DNA test as a joke and finding out one of their sons has a different biological dad.Donna and Vanner Johnson, from Utah, US, thought their two sons were both biologically theirs.They used an IVF clinic to help with conception for their second child, who is now 12 and were delighted to welcome him into the world.But the couple were left heartbroken and confused when the home DNA testing kit came back with "father unknown" – shattering what they believed about their family.It transpired there had been a mix-up with sperm at the fertility clinic.Speaking to ABC4.com, Vanner says: "When I looked on that page and saw mum for him and.
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