I don't know what it is about kids and dome tweeters, but that sort of thing happens quite a lot
I must also point that, if you wish, you undertake the following entirely at your own risk - don't sue me!
In the trade, the usual way to 'recover' a pushed in tweeter (if it's not too bad) is to get a few inches of sellotape (or equivalent) and VERY GENTLY AND LIGHTLY touch the sticky side to the depressed area of the dome. The idea is that the tape will adhere to it the dome material and then you can SLOWLY AND VERY GENTLY pull the dome back into shape. It may take several attempts to achieve the desired result, but it does normally work.