Christmas is for Only the Monogamous Amongus

I was in a card shop today looking for a card, and I spotted one with this confusing (or, perhaps, comforting, depending on your personal life) message on the front: "For My Only Wife".

I looked, but I couldn't find any that said "For My Other Wife" or "For One of My Wives".

I really think that if they're gonna go there, they should go all the way.