Separate Apple IDs on Apple One Family Plan

I am thinking of getting my family on Apple one since my brother and I both use Apple Music and I watch Apple TV from time to time. So my question is, if this is set up, how do separate IDs work for things like a music library and Apple TV library? I don’t want my brother and I to have each other’s music show up on our devices and I don’t want everyone to be forced to be on my account for something like Apple TV. Basically, I wanted to confirm that all family sharing does with apple one is provides the Apple Music and Apple TV subscriptions to everyone I am sharing with, and not the content we are listening/watching.