An informal, slang way to say 'family' — used especially by younger people, often not about your actual blood relatives but about close friends you feel like family with, or just as a casual way to address a friend, like 'what's up, fam?' It's common in texting and casual speech, especially influenced by hip-hop and internet culture, and would sound out of place in formal writing or speaking to someone you don't know well.

『家人』的口語簡稱（年輕人用語，也常用來稱呼很麻吉的朋友，不一定是真正的家人）