[bcx]

I recommend taking a look at https://teachaccess.org/ as a starting point. They are non profit focused on bridging the gap between accessibility and education.

I think they are mostly focused on college level exercises, but if your kids are doing coding I'd imagine their tutorials would be something to take a look at: https://teachaccess.org/initiatives/tutorial/

As a complete aside for anyone reading this post, I think of improving accessibility as the "curb-cut effect", curb cuts (those ramps on sidewalks while cross streets) were created to improve urban access for those in wheel chairs, but also make it easier to use strollers, bikes, carts, and really for everyone walking in a built environment. When we as technologists make design decisions to make things more accessible I believe we end up with better products for everyone.