A pair of twin sisters in the United Kingdom discovered at the age of 49 that they have different biological fathers in what experts say is an extremely rare medical phenomenon.
According to the BBC, twins Michelle and Lavinia Osbourne learned the truth after taking at-home DNA tests, which showed they are half-sisters despite being born together to the same mother in 1976.
The rare condition is known as heteropaternal superfecundation, where two eggs released during the same cycle are fertilised by sperm from different men. Reports say only about 20 documented cases have been identified worldwide.
The sisters, born in Nottingham, had a difficult childhood and said they relied heavily on each other for emotional support while growing up in foster homes and with carers.
Lavinia described the revelation as devastating, saying her twin sister had always been the “one constant” in her life.
Michelle, however, said she was less surprised after long suspecting that the man they believed was their father did not resemble her.
Further DNA investigations later identified different biological fathers for the twins.
Despite the shock, both women say their bond remains unbroken.
“She’s my twin sister,” Michelle said. “Nothing takes away from that.”
