My girls are "best of friends"..well, most of the time! When it's just them, they are glued together-
My oldest daughter plays piano. When she practices, my youngest will "sit" on the steps and wait! She waits and waits and then waits some more. She also will announce throughout the 1/2 hour of practice...that her sister has 14 more minutes, 7 more minutes even 40 more seconds!
I think my youngest gets more upset when I say "Practice Piano" then the one who actually has to practice!