This is all so foreign to me. I honestly can't remember ever being in a dinner party or family dinner where people were "served," except when going out to restaurants (and I haven't noticed any particular pattern there, it just seems to be whoever's food is done cooking first). My family usually didn't eat together, and if so it was in front of the TV instead of around a table, but even when we did everyone served themselves from the food dishes on the table. The only "rule" that I followed was I didn't start eating until everyone had served themselves, but even this nobody actually cared about.