Another Memorable Thanksgiving

I spent Thanksgiving in southern California with Jaime's in-laws. I've been trying to figure out what's the best wording to describe the family of my son-in-law. Evidently, relationships through marriage are technically called affinity, as opposed to consanguinity, for blood relations. But that's a bit of a stretch. I'm thinking co-in-laws or maybe out-laws! But that's who I spent the holiday with.