I think in California home school is designated as a private school so legally it may be ok. You could have 2 teachers - one maths/science and one language/arts and have them do half days each or 2 full days each. Or you could hire someone full time and have them supervise on line classes in areas the can't do - if you could find someone who could cover language/history etc it is easy to find good on line maths. This assumes the kids are old enough to need specialists.