The woman meets her in-laws, and the mother-in-law seems crazy at first. Then the mother-in-law slowly shows the girl that the two guys, the husband and father-in-law, are monsters or aliens or something. They go out into the woods and find...I think it was a nest? or something like that.
They go back to the in-law's house. It doesn't end happily.
That's all I remember. It was a sad creepy story and I really want to read it again.