Have some younger kids interested in role-playing games? AWESOME.
It's easy to think Table Top Role Playing Games are too "advanced" for kids but that's only because as adults we're prone to over complicating things. At the heart of TTRPG's is sitting around and playing pretend, kids are champions at that. Instead of worrying about dumbing things down learn how to dig through the adulty nonesense and pull out the base fun stuff.

Challenge yourself to listen and I bet the kids teach you how to be a better story teller.

​Here are some resources to get you started.