Anonymous wrote:How old are your kids?
For the most part: "I'm proud of you, good luck!", "Can I help you practice?", "Let's make sure we give ourselves extra time to get there." You can ask their teacher/director/coach if there's anything they'd recommend. But based on my experience as a kid, it's best to not be over involved and give them a little space.
I'd also research some summer camps, a lot of colleges and local theaters have camps, engage with your kids in what they're interested in.
Solid advice.
If my kid is auditioning for a shall we usually listen to some of the music and watch the show (if it's one of the junior productions you can find full versions of them on YouTube or we watch the movie version) just if she has an idea of what the show is about and what parts she might want to try.