Thanks everyone!
you all are correct. Compulsory education doesn't start until 7 years old. But there is a new law in the working right now that would change that to 6. The reason why I'm worrying about this already for DS3.2 is simple. He will be turning 4 next spring and I want to start officially / unofficially early Kindergarten with him in the fall after he turns 4 so we can be on track for a skip if we need to put him into a public school later on. There is no early entry to 1st grade in IL but starting K and 1st early homeschooling could get him on track for early 2nd grade in public. Same thing with DS4.9. He's enrolled in K for this fall but there is a good chance we'll need to pull him out, at which point we might do both K & 1st in the same year. So while it seems homeschooling is still far away in our case, it really isn't.
