Wind Family, String Family, Percussion Family, Keyboard Family
I had a talk with Stefon Harris a while ago. I don't think I've talked about it here yet.
The argument is this: The piano is part of the percussion family but percussionists don't learn piano. The piano is in a performing way, NOT part of the percussion family at all. It requires a lot of dedicated and unrelated skill and has moved out of the percussion family. Not how it's made of course, or the mechanisms that make the sound but in a performance way.