Addressing future daughter-in-law

Question

My wife and I are going to my son's and future daughter-in-law's engagement party tomorrow. We have a gift and want to sign the card personally but without offending her father who will be there. She is fluent in Spanish. She once called me papita (I think) but I can't find that in any Spanish dictionaries. What would be an appropriate familiar signature in Spanish without seeming presumptuous.
Thanks. Waiting to sign the card.

Answer 1

Well, your card is most likely long since written, but I might have suggested that you sign something such as "your future Mom- and Dad-in-Law!" -- inviting her in a nice way to perhaps call you "Mom" and "Dad" as your daughter-in-law.