Twins have different fathers after mum admits to cheating on partner while ovulating
Twin siblings who look nothing alike have been confirmed as having two different fathers after their mother admitted to cheating on her partner while she was ovulating.
Scientists in Vietnam confirmed the extremely rare case of bi-paternal twins after a couple sought a DNA test for their two-year-old twins due to one child having thick wavy hair while the other had thin, straight locks.
According to Vietnam's state-run news agency VNS, the mother's 34-year-old husband was urged by his family to seek the tests to rule out the possibility of a hospital mix-up shortly after the twins’ births.
However the tests run by the Genetic Association of Vietnam (GAV) found that there was no mix up and that the children had the same mother but different fathers.
“Our Centre for Genetic Analysis and Technology lab has tested and found a pair of bi-paternal twins,” said Le Dinh Luong, GAV president.
“This is rare not only for Vietnam, but for the world.
“There are only less than 10 known cases of twins with different fathers in the world. There might be other cases but the parents and/or the twins were not aware of it or didn't want to announce it," he added.
Bi-paternal twins are born when a woman's eggs are fertilised by sperm from two different men during the same ovulation period.
The phenomenon is known as superfecundation, and is extremely rare due to the short-lifespan of women’s eggs.
The time window that eggs can be fertilised is a matter of hours, while sperm cells are capable of living inside a woman's body for only four to five days.
Following the revelation the twins’ mother admitted to cheating on her husband before they were married, reports the Tuoi Tre newspaper.
Last year, a US woman applying for child support from the father of her twin daughters was shocked to discovered that the man was the father of only one of the twins.
Turkish media reported a similar case in 2010 involving twin boys.