Hi BwanaWill - sorry to read about your tough situation.
I think I agree with what others have said ie to move to where your support network is which would be the best thing for your son.
I'm from the UK and maybe things are different but the max figure you gave of 21 weeks rehab sounds very long to me. I would have thought the 6 week figure is the more likely (closer to 6 than 21 anyway)
Good luck whatever decision you make