We're kind of all over the place on weekends but we always eat lunch... usually sometime in the middle of the afternoon, and often not all of us together... but we all need a meal between breakfast and dinner... (we also eat dinner late... like 8:30ish on weekends it's perhaps a chicken and egg issue with the mid-afternoon lunch but whatever).
I'm a coffee and toast for breakfast lady, so I ALWAYS need lunch. DS makes oatmeal when he gets up, and eats again when SO or I get up because he wants what we have (how is he so skinny)... but he's still hungry by lunch.
I'm not talking about a big meal... a sandwhich, a small plate of leftovers from dinner, a salad, soup... but yes, we eat.
DS is 8 though, so I don't "fix" lunch for everyone. Everyone here is capable of fixing their own. If we're all hungry, I'll make a lunch for the three of us, if not everybody just gets what they want when they want it and eats and the kitchen table.
I make a real, from scratch, meal for dinner.