10. Get some alone time with the sweetie.
Make a run down to the grocery store together to get the half-and-half that Mom forgot, or take an after-dinner stroll around the block, or some such. If you're with the family for more than a couple of hours, you'll definitely want to check in with your sweetie to make sure that you're doing okay and they're doing okay, and to reaffirm said sweetie's identity as a desirable grownup person.