Joseph,
1. No right is absolute. Parents do not have the right to educate their children to be gangsters or spongers.
2. So limit your family’s size to your means. In any case, if they have good jobs they will at least need less. Moreover, there is a halachic prohibition against taking charity from non-Jews. These communities should support their own.
3. If the students are doing so well the school will pass muster.