"Family supper" refers to a meal that is shared together by members of a family. It is a time where everyone in the family gathers around the table to eat, talk, and spend quality time together. Full definition
Set the scene for a casual family supper or grand dinner party with beautiful dining furniture. (furniturevillage.co.uk)
Hence the slogan: «Family Supper at Burger Chef.» (firstthings.com)
I have a casual family supper on Christmas Eve and use a lot of vintage red and white checked cloths for the table, napkins, and basket liners. (nousdecor.com)