Canadian, Eastern. My mother’s house has two sets of manners (well, three really, but only two that are relevant to dinner).
Every day:
Serving will probably be directly out of the cooking vessels, and every one sits around the island in the kitchen.
You can condiment your plate right away, but we prefer you delay actually eating until everyone’s sitting. If it’s hot food and my mother’s still putzing around in the kitchen, she’ll probably tell us to start without her, and mean it.
Seconds are encouraged, though the polite thing to do is wait until everyone has had a chance to finish their first course before going back for more. My parents will probably offer them to you, but there is no need to wait for them to do so.
We often set the island with cutlery for these casual meals, but no one gets fussed about where your napkin is or how you’re using your knife and fork (my parents handle theirs american-style, my boyfriend and I prefer british-style), as long as you use the napkin, chew with your mouth closed, and keep your elbows out of the way of others.
Rinse your own plate. If my mother bitches about people not doing the dishes (as opposed to not clearing/rinsing/stacking), I lovingly remind her that she bought a dishwasher for a reason and she doesn’t have to do dishes either.
Tell her it was great (because it always is). Plot to steal any leftovers for midnight snack. Drink more of my step-father’s wine and relax.
Holiday dinners:
These involve my mother pulling out the extender for the dining room table and her grandmother’s china and silver. Holidays usually include some friends and extended family, including my nana, who is a product of a more formal age, fairly religious, and with the advance of her Alzheimer’s, easily upset by uncomfortable situations.
These involve proper servings dishes that get passed around the table (unless something is very heavy, in which case you pass your plate down to whoever’s sitting in front of the turkey/heavy thing before you load it up with anything else), and a grace before starting, courtesy of my nana. We’re generally on best behaviour for her as far as dinner conversation goes, but aside from that everything’s about as relaxed as every day dinners.
The thing about holiday meals is not so much table manners, as it is if my mother tells you do something when she’s cooking for 15 people, do it as quickly as possible without arguing and then hide until she calls your name again. She’s normally pretty relaxed, but swears like a sailor when she’s doing the big dinners.
Other meals:
Eat whatever you want, whenever you want, however you want, just make sure everything’s washed up when you’re done.