numeral · people or groups who share a close bond, common interests, or collective identity

两岸同胞都是一家人。

numeral · referring to all the members of a family collectively.

我们一家人打算去旅游。

numeral · the members of a family as a collective unit.

他们一家人去年夏天去科罗拉多自驾游了。

numeral · the collective members of a single family or household

我们一家人打算明年去旅游。