The story was revealed after the couple, from south-eastern Xiamen city, had to register the birth of their twin sons at the local police station early last year. In order to complete the registration, they had to produce the results of a paternity test to prove that the babies were theirs.
The husband, identified only as Xiaolong, had wondered why one of his sons didn’t look like him.
Upon receiving the DNA results, he was even more shocked at discovering that one of the boys did not have any biological relationship with him, according to a director at the Fujian Zhengtai Forensic Identification Centre.
According to the director, Mr Zhang, Xiaolong was furious after reading the DNA report and confronted his wife.
It is reported that the wife initially denied the affair, and accused her husband of falsifying the results. Upon being confronted by Xiaolong, the wife admitted she had slept with another man and that it was a one-night stand.
The father said he was happy to raise his own child, but not the one from someone else.
Twins being born with different fathers is an extremely rare occurrence, known as heteropaternal superfecundation.
According to experts, 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, according to The Guardian.