When a family decided to take DNA tests "for fun", the mum never predicted the bombshell that would be revealed as a result - their youngest son was, in fact, a stranger's.
Donna Johnson, 47, and her husband Vanner, 47, took DNA tests along with their two boys - Vanner Jr, 18, and Tim, 12. She explained they took the test "for fun" in order to discover more about their heritage.
But when they got the results back, Donna was shocked. "Reading the DNA tests results online, I figured there had been a mistake," she wrote in The US Sun.