numeral · all the members of a household or family

我们一家四口打算今年夏天去南方旅游。

numeral · a business organization, shop, or collective group

这是一家非常有名的老店。

numeral · belonging to the same household, family, or origin

既然大家都是一家，就不必见外了。

numeral · the family group of a specific person (often preceded by a surname)

张一家人都搬到北京去了。