Re LW#1: I disagree with C&F's I’m not crazy about the “pick one sport/activity and one instrument” directive. Young kids do benefit from extracurriculars in many ways, including socially. We found with our kids that they needed to try a few activities to figure out what they liked (or didn't). That said, let the child decide which activity(ies) to stick with, even if they're not activities LW would normally think of. If they still don't like the activity after a good-faith effort to participate, don't force them to continue!

Am I making my kid miserable because I regret quitting piano as a child? Yes LW is, so they need to stop trying to live through their child. LW's daughter has learned the music fundamentals that piano teaches which will serve her well. Plus she has bona fide music activities she enjoys--so what if it's not piano? Dance lessons imho would be a great adjunct activity, but LW should get advice on what works best with theatre.

Re LW#2: Jfc Mia's parents are not only trying to live through their child, but their need to see Mia crush everyone will not end well for Mia. Worse, Mia's behaviour has escalated into bullying Jess and that needs to stop. Teaching Jess to stand up for herself is a good idea, but LW should check in with their teacher(s) too.

Also, imho LW should check in with Jess periodically to confirm she is still interested in continuing her activities.