"...the mission of education must always be carried out in accordance with a proper application of the principle of subsidiarity. This implies the legitimacy and indeed the need of giving assistance to the parents, but finds its intrinsic and absolute limit in their prevailing right and their actual capabilities. The principle of subsidiarity is thus at the service of parental love, meeting the good of the family unit" (TMHS, 23).
There are various ways of helping and supporting parents in fulfilling their fundamental right and duty to educate their children for love. Such assistance never means taking from parents or diminishing their formative right and duty, because they remain 'original and primary,' 'irreplaceable and inalienable.'
Therefore, the role which others can carry out in helping parents is always (a) subsidiary, because the formative role of the family is always preferable, and (b) subordinate, that is, subject to the parents’ attentive guidance and control.