请问：the Li family 是单数还是复数

可以是单数,也可以是复数
当家庭作为一个单位时,用单数,如：
The Li family performs better than the Zhang family in the contest.
李家人在比赛中表现比张家人好.（一家人为一个单位）
当强调全家人（人数众多）时,用复数,如：
The Li family are singing and laughing when they get together at year-end.
当李家人年底相聚时,他们又唱又笑.