谁家 literally means 'whose family' and functions as a noun phrase referring to someone’s home or household. The character 谁 (shéi) means 'who', and 家 (jiā) means 'home' or 'family'; together, they form an idiomatic expression used to ask about or refer to the residence or family of an unspecified person. It often appears in informal spoken Chinese, especially when asking where someone lives, whose belongings are being discussed, or when making polite or vague references to others’ homes.

This phrase is commonly used in everyday conversation—such as when borrowing something ('Whose house is this umbrella from?'), inviting someone over ('Come to my place!' → '来我家吧！' vs. asking 'Who’s house are we going to?' → '去谁家？'), or commenting on shared neighborhood life. It carries a warm, colloquial tone and avoids naming individuals directly, making it socially flexible and slightly indirect.