JBDad, I've had similar concerns about teaching GS9 things after school and on the weekends. One funny event spawned by this, his teacher was a bit exasperated after he once again said, "I know that, my grandma already taught me." She said, "Is there anything you've learned at school this year?" He said, "No, not really." haha, but I think he said it very innocently and truthfully because he didn't get in trouble!

This year, I pretty much came to accept I would be teaching him after school & weekends, and he would get increasingly further ahead of his classmates. But what is the alternative, let him veg out on TV & video games 5 hours/day, all day on weekends?

BTW, whoever posted about the 6 yr old daughter doing Greek this week, if she's still into it long term, let's get acquainted in 20 years! GS9 is loving his Greek & Roman history & mythology books!