We used to have one family at a time over on Sundays, but now it seems I have a house full of teenagers on Sunday! I have to cook a LOT not knowing how many kids will show up. With our own kids, my oldest and his wife, and a bunch of teens, we usually have 10-15 people for lunch on Sundays.
It's different from the way we used to do it, and my dh and I don't really have any adults (other than my son and his wife) to visit with, but I like that the teenagers feel comfortable to gather at my house.