Anonymous wrote:You privately ask her if what she said while drinking was true (gives her a chance to deny it in which case you are no longer on the hook for knowing since to you it was a drunk lie) If she admits it again, ask what she plans to do now that ancestry tests have become so common. You say you're worried your DH may get contacted by someone. That switches the dynamic over to help her realize that she is not in full control - his paternal family could easily find him in this day and age. You say she's conservative so there is little chance she'll confess to her family now.
That said, asking her again does dig you in deeper. Currently you can claim you didn't know because you dont remember any such conversation during a drinking night. Asking again proves you remember. Then you will need to tell her you can't carry her secret.
My nephew, who had done a 23 and me a few years ago, got a text message last year. He always knew he was the product of a one time encounter between my sister and a guy in the neighborhood before she was married, and adopted by her husband when she did marry. He was just interested in ethnic ancestry, which came up pretty much as expected. But the guy who was born from this guy's other encounter (during a three month split with his fiance) had no idea his father was not his bio father until the 23 and me, which think his wife bought him just for fun (she did one too). I think his legal father was dead by then and it did cause an unheaval.