I tried out Stories RPG via the pre-made Starsworn games, and this was awesome! Lots of opportunity for creativity and collaborative play AND it was rules-lite enough that my 3yo picked it up within the first session.
In the pre-made Starsworn adventures, it requires basically no prep (it teaches you the game as you play) and the coloring sheets are great for helping with fidget breaks for kids.
I definitely recommend trying it out, and I have a full review below if you want more info/details on how it went with my kiddo!
https://www.ttrpgkids.com/2021/11/18/kids-ttrpg-review-starsworn-and-the-stories...