As this article says, there are many children from this tribe enrolled in this school. Then that school should have a course in that tribes language and all teachers should be required to speak that language. This now happens in many schools in the Western states that the teachers have to be bi-lingual in Spanish. What about not allowing for those children to attend school until they all speak English?

Since this school is a Catholic school, it is a parochial school, somewhat like a charter school. The rules and laws for these schools are not exactly the same as for public schools. In fact, these schools have a lot of autonomy. They can determine much of their own requirements for attending.

Since the parents are not required to send their kids to this school, if they don't like it, they can find other options. There are other parochial schools in the area.

Heaven forbid that this Catholic school becomes so bad that the kids are better off in a public school. But, if it DOES get that bad, then the better choice is the public school, of course.

When a school (or any other organization) is a voluntary organization, it is against the principles of freedom for Government to force it to obey rules that are not required by law. The only possible time Government should step in is when the school does illegal activity, or when it harms its students by NOT obeying its own rules. Other than that, the parents should take their kids out of the school if they don't like it, and send them somewhere else.

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If a particular school is the only school in an area, and if the kids are required by law to attend school, it is the duty of the State to set up proper public schools in a locations reasonably accessible by the kids, or provide busing. Most, if not all, States meet legal schooling requirements, one way or an other, for all the children of the State.