An 'extremely rare' case of twins born with different fathers has been reported in China after a DNA test was ordered.
The bi-parental twins were taken for testing because of stark differences in their appearances.
Twins born with different fathers can happen if two eggs from the same mother are fertilised by sperm from two different men during separate acts of sexual intercourse within the same ovulation period.
The rather tragic story was revealed after the couple had to register their twin sons at the local police station early last year. The registration process required the parents to produce the results of a paternity test.
The mother after being confronted by the husband confirmed that she had a relationship with another man too.
Twins being born with different fathers is an extremely rare occurrence, known as heteropaternal superfecundation. The exact odds of the phenomenon are hard to calculate, but previous studies suggest the chance could be between one in 400 pairs and one in 13,000 pairs.
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