In this case, the pronoun is ' it ' and the verb is singular. My family is happy. This does not apply to all collective nouns, so be careful. Police and staff are always plural. 用法总结 A secret about ...

This is the house in which I grew up. This is the camera with which I take all my professional pictures. 在本期节目中，我们给大家详细讲解 which 在关系从句 relative clause中做为关系代词 relative pronoun的功能。