Sorry if this is confusing. It's a pretty confusing situation to begin with.
One of our groomsmen and his wife gave us $ as a gift. The groomsman doesn't make much money so we know the $ actually came out of his wife's account. We are friends with the wife only because she is married to groomsman. Two days after our wedding, the wife was caught cheating on groomsman and moved out.
My question is how do we address the thank you note? They both signed the card so it was technically a gift from both. We don't want to send one card addressed to both of them because they are not together. If wife was not married to groomsman then she never would have been invited to wedding, but we don't want to leave her out since we know it was actually a gift from her. We also don't know what her new address is so we can't really send a thank you anyway. Do we send two separate thank you notes? Do we just send one to the groomsman? TIA