NBC News reports:
A federal judge in California ruled Thursday that a twin son of a gay married couple has been an American citizen since birth, handing a defeat to the U.S. government, which had only granted the status to his brother. The State Department was wrong to deny citizenship to 2-year-old Ethan Dvash-Banks, District Judge John F. Walter found. The lawsuit filed by the boys’ parents, Andrew and Elad Dvash-Banks, sought the same rights for Ethan that his brother, Aiden, has as a citizen.
Each boy was conceived with donor eggs and the sperm from a different father — one an American, the other an Israeli citizen — but born by the same surrogate mother minutes apart. The government had only granted citizenship to Aiden, who DNA tests showed was the biological son of Andrew, a U.S. citizen. Ethan was conceived from the sperm of Elad Dvash-Banks, an Israeli citizen.
There’s much more about the unique case at the link.