I started writing plugins for Minecraft as he plays that. He didn't pick up on the coding, but he likes to give me ideas about what the end result will be.
I find more interacitve places like roblox studio work better for younger kids as they can visulize what is being created and to an extent (a limited extent) how.
I have found with my younger brother that he draws up ideas and i code them up with him as well as fun but simple things like flying by clicking q on a qwerty keyboard which he then and does the more visual stuff such as make the person where supermans clothes suddenly appear when q pressed.
(He's around 8 for reference.)
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