Location matters a lot on a question like this. I'd be happy to teach how to do repairs and allow for tool use; my wife is working with a home school group to set up me teaching woodworking but the shop space also includes bike repair and that's been coming up as a question as well. I've got 3 kids and a wife that rides. All of us like to ride velodrome so 4 bikes (wife and I share), all of us ride mtb so 5 bikes, one rides bmx though the youngest now wants to, and everyone rides road/cross/gravel which means another large grouping. Wife and I have separate cross and road while the kids just use cross bikes for both. Needless to say, getting an annual tune up would be a ridiculous sum of money making learning how and getting the tools worth while.