I was practicing playing my trombone today while being interrupted every 2 minutes with "Can we try it now?" So the girls finally got a chance to practice holding it properly, which is hard because their hands are small, and trying to blow while moving the slide.
It's a tricky maneuver when you first play the trombone because if you move the slide back up too fast you end up smashing the mouth piece into your lips. Both girls did well, in my opinion. By the time our kids graduate from homeschool I plan for them all to be able to play the trombone, trumpet, piano, and any other instrument they take an interest in after that. Guitar would be fun. Maybe Uncle Matt will give them lessons?