We're in the process of writing thank you cards, and have a tricky situation. We received a gift from a person who attended the wedding, but also a person who was not invited (his adult daughter) and that I've never met (nor do I think I'll meet anytime soon). I want to be sure to thank her father for attending, but feel weird calling him out and essentially disregarding her (plus, like I said, she wasn't even invited). How would you handle? Or, do I just disregard the daughter altogether and just address the father throughout the whole card?