That's the Convention on the Rights of Children, for those who are not up on the world-stage crypto-speak.
Brazil used to enshrine the right to homeschool in its constitution. It was there for decades, through several iterations of its constitution. The 1937 constitution had model language for the right ordering of authority over children, well in line with the principle of subsidiarity, explicitly stating parents have primacy. Along came the 1988 effort to re-write it, and those protections were nicely deleted. With the Child and Adolescent Statute written explicitly to conform to the CRC, Brazil government bureaucrats have now managed to discern that homeschooling violates the constitution.
There are more serious problems with the CRC than that it leads to this kind of state control of schooling, as if education is fundamentally a state function. More gravely, the CRC effectively implies that children belong to the state more than they belong to parents. This is just one step removed from totalitarian regimes that think ALL people belong to the state to do with as it will. But this is proof positive that the liberals who had claimed that the CRC wouldn't lead to these sorts of eviscerations of rights were flat wrong. The proof is in the Koolaid, and most nations have drunk it.