I you'll find think it means "big family" even though there is no 人 after 家
家 can mean home or family. It's also a "classifier for families or businesses". Like in这 家 饭 馆 or This family restaurant.
Since Chinese are very family orientated people and the Han Chinese in particular see themselves as one family, I go with the family not house option.
It's also quite nice to think that everyone is the big family.