A New Jersey judge, persuaded by DNA testing, has ruled that a man believed to have fathered twin girls is only responsible for one of them. In what this report calls the first case of its kind in New Jersey, and the third nationwide, a Superior Court judge in Paterson ruled that the man would only be responsible for child support payments for one of the girls.

The girls’ mom sought public assistance after the birth and named the man as the dad. But after she told social services officials she’d had sex with another man during that same, key week, the agency ordered a DNA test. The result? Something rare but not impossible: superfecundation. In other words, the two eggs were fertilized by different men during mom’s same menstrual cycle.

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