I have always wondered something about the Passover seder. Is the host being motzi everyone with his seder plate, or does everyone/every head of household* need to make a plate and personally carry out the entire seder? If not, what parts of the seder must be performed individually? (For example, those listed here? ... Karpas? Yachatz? Motzi matzah? Korech? ... Other parts?)
*I am also wondering if a husband would be motzi his wife and children over bar mitzvah, or if either of them would need to make their own seders.