A family of three probably doesn’t need a dishwasher capable of holding 15 place settings. That is unless you cook a lot and wash all your pots, pans, and cookie sheets in the dishwasher. A large family of five or more people may need that high capacity on a daily basis. High capacity dishwashers cost more, so look for a model that meets your needs, but isn’t overkill for the kind of entertaining and cooking you do.