Family visits my in-laws every December in Florida. They are very generous and have been over my marriage to their daughter. When we go out with the, DW, daughter and boyfriend I find it's important to pick up the tab. Each year I need to find a new trick to tell the maitre d' that it's my expense, and my FIL tries likewise (not as much recently as he can;t run as fast any more.) I've tried the bathroom at dessert, the call-ahead, the slip the waiter $5 to give me the bill, etc. I am running out of ideas.
Any good ones that have worked for others?