Dignitatis Humanae §5

⁵ The family, since it is a society in its own original right, has the right freely to live its own domestic religious life under the guidance of parents. Parents, moreover, have the right to determine, in accordance with their own religious beliefs, the kind of religious education that their children are to receive. Government, in consequence, must acknowledge the right of parents to make a genuinely free choice of schools and of other means of education, and the use of this freedom of choice is not to be made a reason for imposing unjust burdens on parents, whether directly or indirectly. Besides, the right of parents are violated, if their children are forced to attend lessons or instructions which are not in agreement with their religious beliefs, or if a single system of education, from which all religious formation is excluded, is imposed upon all.