where you have as your legal residence will decide what school he can graduate from assuming you are looking for a HS diploma. Having said that it appears you have been given two things to look into an online charter school and Citizens on line school. Have you spoken with the administrators of the Christian school that he attended, they maybe able to give you information on a home schooling program that he could use, no matter where home is. Often snail mail, email, and on line can all work together.