Couple who took DNA test ‘for fun’ shocked to discover husband is not son’s biological dad

An American couple who ordered an at-home DNA test as a joke were devastated when they received their results.

Donna and Vanner Johnson, from Utah, had hoped to learn more about their backgrounds when they ordered the home DNA testing kit.

Yet when they got their results, they were dismayed to learn that their 12-year-old son was not Vanner’s biological child.

He had been conceived using IVF treatment at a specialist fertility clinic, where it appears there was a mix-up and a stranger’s sperm was used to fertilise Donna’s egg.

Donna said she first knew something was wrong when the results showed that the couple’s oldest child was only a half-sibling to his little brother, related only through her.

On discovering the life-changing results, Vanner said: “When I looked at that page and saw mum for him and father unknown, I thought, ‘what do you mean, father unknown? I am his father.”

The clinic that carried out the couple’s fertility treatment has since confirmed that a stranger’s sperm was used to fertilise Donna’s egg.

After a year had passed, Donna and Vanner made the decision to track down their son’s biological father, who had visited the clinic on the same day as them. They have since travelled to meet the man and his partner.

Both couples are now in the process of taking legal action against the clinic in question.

AlphaBiolabs offer a range of DNA relationship tests, including our at-home paternity test and our prenatal paternity test.

To find out more about our DNA testing options, contact our friendly Customer Services team on 01 402 9466 or email

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