She had twins from different parents, one from her husband and one from her lover … Yes, believe it or not, it's possible!

The man always seemed to hit the huge physical difference They showed their twins in their features. In fact one of them did not look like him at all. Neither their mouths, their eyes, nor their lips. Nothing

But he took it with grace and naturalness. He never suspected that it was not his son.

However, as part of routine testing to register his children at the Xiamen Civil Registry in China, he had to present his wife with a genetic badysis that demonstrated the paternity of the two. .

The results came with surprise: The two children shared some of their DNA with their mother, but one of them had no trace of his father.

It fell like a bomb in the couple. The mother first accused her husband of falsifying the badysis, but ultimatelyHe guessed that he had had a bad night with another man.

"Of course, I want my son, but I do not want to raise the son of another," said the father, whose name remains anonymous, to the Chinese newspaper. Detroit Herald.

The information was leaked by the Fujian Zhengtai authentication court of Xiamen and constitutes a rare case of what is called in biology "heteropaternal superfecondation ".

Normally, when a pregnancy occurs, the body usually blocks the release of more eggs. But sometimes, it does not happen, so a new egg can be fertilized. If it is the same father, it is called "homoparental superfecundation" and if it is fertilized by another man, it is called hetero For this, the woman must have bad with both men a few days apart.

"It's a very special case, it's fraternal twins [de dos óvulos distintos]. This is a very rare and unusual case, "said the director of the Forensic Authentication Center.

The case has had a huge impact on Chinese social networks, with speculation about the future of the family.

Heteroparental superfecundation, strange in humans, is common in dogs, cats and cows, in whom the exchange of badual partners over a short period is much more common.

Two scientific studies from the early 1990s, cited by The Guardian, provide different figures on the frequency of these cases. We place them in 1 case out of 400 fraternal twins. Another, he argues that it is one in 13,000. But there are few studies on the subject and cases are only revealed when there are doubts about the parternidad and that the parents decide to do a genetic badysis.