Coming from a divorced family, a family dinner out was 3 people, mom, myself and my sibling. Being the oldest I was tasked with jumping out of the car and putting us on the waiting list if the place was full.
When I was feeling obnoxious I would tell the hostess our last name was Donner and that there were 4 of us. When our electronic drink coaster would start vibrating, we'd walk up and they'd ask "Donner, party of 4?" I'd reply, "We were, but got hungry, now it's just 3."
....and my mom perfected the double facepalm well before it got popularized on the internet.
Fun sideline almost 20 years later, my wife and I were waiting with my mom for a table and they called out for the Donner family, both my wife and mom shot looks at me as another family stood up claimed their table. I just grinned.