Have you considered teaching your children at home and avoiding the public school system? You should know that the home school curriculum is not unlike the lessons they will learn in a school classroom. The school district you live in will have a requirement that you must follow and have the child work through. Parents are not allowed to remove their children from school and teach them anything they want to. They must follow the home school curriculum and present the results to the school district regularly. There is a standard education that all children must get no matter where it is received. Learning at home with no guidelines may not provide the child with the basics he needs for life.
If you make the decision to follow the home school curriculum and keep your children out of main stream education you will need to take on the responsibilities of the teacher. You will need to have a lesson plan and make sure that there is time spend on the books everyday. It will require a great effort from the adults supporting the idea. They will be taking on the job of a full time teacher and need to be responsible for the lessons. The children will not keep working in left to their own choices.
The school district you are in will provide you with the home school curriculum and the expectations they will have for your child. You will need to stay in touch with them and ensure you do not let the work fall in priority. If you cannot ensure your child keeps up with his classes and grades you will need to return him to a regular class room.