“在某人家里”常见的英文表达有 at someone's house 或 at someone's home。
at someone's house：更侧重于具体的物理场所，即那所房子。例如：I'll meet you at Tom's house.（我会在汤姆家和你碰面。 ）
at someone's home：更强调家庭环境和氛围，带有一定的情感色彩。例如：We had a great party at Mary's home last night.（昨晚我们在玛丽家举办了一场很棒的派对。 ）