I know the outer envelopes for the invitations should state "Mr. and Mrs. Kevin Smith." For some reason, I thought the inner envelopes could be more personal, such as "Uncle Kevin and Aunt Linda." Am I way off? I've seen online that the outer shoud be "Mr. and Mrs. Kevin Smith" and the inner should be "Mr. and Mrs. Smith." I don't like this, but don't want to stray too far from what's expected. Any advice?