Ah... love this We try to enforce a "no whining voice"-rule, and it really does works wonders.

Most of the things I think of are more related to what you personally should do (keep your personal stuff out of "public" areas, volunteer for breakfast/dinner/doing the dishes etc), but I can't think of any effective way of conveying those rules to the clueless who "just don't get it".

Enforce very strict TV rules, in particular if the TV dominates the most strategic place in the living room.

Make the kids go outside to play. They are just as affected as the grown-ups with being stuck that many noisy people in that little space.

Get the kids a solid breakfast. There's few thing worse than kids that are whining because they have been up for 3 hours with nothing substantial to eat. In fact, get everyone who's up at say 8:30 a solid breakfast. Each day.