are children allow to play basketball inside

Yes! Check our post "Youth Open Gym"

I don't know. I go to the boxing gym

In reality no. There's always something going on during the weekend and they never update the calendar or post anything online about the schedule. They just put a "NO FREE PLAY TODAY" sign up there and when you show up it's too late. During the week when they're not LATE the gym is open from 2-4:30-ish.

Yes... but only during free time. Like right now there's a basketball tournament, which prohibits free play during this time period. Please call ahead to ensure the courts are open.

Yes