Would it be sinful for Catholic parents to unschool their children?‎

Catholic.com is actually paying Google to advertise a popular forum discussion about Catholic Unschooling:

Here is the link to the discussion:
https://forums.catholic.com/t/what-does-the-catholic-church-teach-about-unschooling-would-it-be-sinful-for-catholic-parents-to-unschool-their-children/394038/51