Dungeon World is supposed to be good for kids with its easy to understand mechanics. It is a soft pg-13 though, so ymmv. But if you are the DM, you can control

Dungeon World is supposed to be good for kids with its easy to understand mechanics. It is a soft pg-13 though, so ymmv. But if you are the DM, you can control the level of violence. I'd recommend doing more research on it or checking out their reddit with additional questions.