A pair of twin sisters have discovered they have different fathers in what is believed to be the first documented case of its kind in the UK.
Michelle and Lavinia Osbourne, both 49, found out the separate identities of their fathers through DNA tests after years of doubt about their parentage.
The sisters were conceived naturally, grew in the same womb, and were born within minutes of each other. But they are technically half-sisters, not biological twins.
Michelle and Lavinia Osbourne have always shared a special bond. But in September 2022, an at-home DNA test revealed something astonishing: the non-identical twins do not share the same father.
They were conceived naturally, carried in the same womb, and born minutes apart to the same mother in Nottingham in 1976. Yet they are half-sisters.
The twins are the result of an incredibly rare biological process called heteropaternal superfecundation. It occurs when a woman releases more than one egg in a cycle, each is fertilised by sperm from different men, and both embryos survive the pregnancy.
Only about 20 cases have ever been identified worldwide. After months of research for BBC Radio 4’s The Gift, Lavinia and Michelle are believed to be the only set of twins with different fathers ever documented in the UK.
For Lavinia, the discovery was devastating. The sisters had a difficult childhood, moving between homes and carers. Their mother, 19 when she gave birth, was often absent.
At five, they were left in Nottingham with a friend of their mother’s, whom they called “grandma”. At 10, they joined their mother in London, but were later sent to one of her old foster homes.
When they asked about their father, their mother always named a man called James. He was not in their lives until they were teenagers. Lavinia tracked him down and felt a resemblance, but Michelle was never convinced.
By late 2021, their mother had early-onset dementia and could no longer answer questions. Michelle bought a DNA kit. The results arrived on 14 February 2022 — the day their mother died. James was not her father.
Michelle later found her biological father was Alex, the brother of a woman who had been friends with their mother. He had struggled with addiction and was living on the streets. She met him through newly discovered family members.
Lavinia then took her own test to settle her unease. It confirmed Michelle was her half-sister, and that James was not her father either.
Michelle searched Lavinia’s results and found Arthur, her biological father. The twins drove to meet him in West London.
“He was a little bit nervous, but he’s got an exuberant character — like me,” Lavinia said. They have since grown close and see each other several times a month. Arthur has told Michelle she can also call him Dad.
Arthur said their mother came to him upset and in shock. “She knocked on my door. She was crying,” he told them.
Michelle and Lavinia will never know if their mother suspected they had different fathers. As non-identical twins, they have always known they were different. At first, the DNA results made those differences feel starker. But their bond remains.
More: BBC News
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