A pair of twin sisters have found out they have different fathers in what is believed to be a UK-first discovery.
Michelle and Lavinia Osbourne, both aged 49, found out the separate identities of their father through a DNA test 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 are technically half-sisters rather than biological twins.
It is the result of an extremely rare phenomenon called heteropaternal superfecundation, in which a woman produces more than one egg during the same cycle, both of which are successfully fertilised by sperm from different men, with the resulting embryos surviving the pregnancy.
The findings were revealed on BBC Radio 4 series The Gift, which reports that only around 20 cases have ever been identified worldwide. The Osbourne sisters are the only twins with separate fathers to be documented in the UK.
Lavinia told podcast presenter Jenny Kleeman: "She was the one thing that belonged to me, the one thing that I was certain about, the one thing that I was sure of. And then she wasn’t.”
Michelle, however, said she “wasn’t surprised” by the findings.
“I’m still in amazement that this can actually happen – it’s super weird, super odd, super rare – but it makes sense.”
Specialists believe some cases may have gone undetected unless there was a reason to question paternity and take a DNA test as a result.
The sisters made the discovery after a difficult childhood. They were raised by a mother who was a vulnerable 19-year-old when she gave birth in Nottingham in 1976.
Michelle revealed that their mother had “suffered abuse at the hands of [her] stepfather” and that she had been “in and out of foster care and children’s homes throughout her childhood”.
Their mother always told them that their dad was a man called James, but the twin sisters did not meet him.
When they were five, their mother left to study at university in London, and left the children with her best friend’s mother who became known to the twins as “Grandma”. She was “strict – not very emotional, not very cuddly”, Lavinia said.
James returned into their lives when they were in their mid-teens, after Lavinia had tracked him down. But Michelle never felt certain that James was her father.
Michelle bought a DNA test kit in late 2021, and the results arrived on 14 February 2022 — the day their mother, who was suffering from dementia, died.
The test revealed James was not her father and, following weeks of investigating her backstory, Michelle discovered her father was Alex, the brother of a woman who was friends with their mother.
Lavinia afterwards decided to do a DNA test, after meeting members of Alex’s family and feeling a growing sense that she was not blood-related.
When she discovered her twin was in fact her half-sister, Lavinia was both devastated and furious, she told the podcast. “I was angry with Michelle for having me go through this, because I just didn’t want this reality.”
She soon found out that James was not her father either – instead it was a man called Arthur, who lives in west London.
Lavinia has built a relationship with her father, and they meet several times a month, often alongside Michelle. Michelle’s own father Alex, who she has met, struggles with substance abuse.
“He’s mine, I’m his, but I didn’t feel like he’s someone I need to take forward in my future with me,” she said. “I just needed to know.”
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