We received an RSVP decline from a family member along with a check made out to "Mr. and Mrs. FI's first name, last name." Our wedding is about a month away, so I'm confused as to whether we are supposed to cash the check now and send a thank you card or wait until after the wedding. I normally hate when people hang onto checks that I've written them, but the fact that it's made out to Mr. and Mrs. has me a little confused.