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Can. 914 It is primarily the duty of parents and of those who take their place, as it is the duty of the parish priest, to ensure that children who have reached the use of reason are properly prepared and, having made their sacramental confession, are nourished by this divine food as soon as possible. It is also the duty of the parish priest to see that children who have not reached the use of reason, or whom he has judged to be insufficiently disposed, do not come to holy communion.
and
Can. 97 §1. A person who has completed the eighteenth year of age has reached majority; below this age, a person is a minor.
§2. A minor before the completion of the seventh year is called an infant and is considered not responsible for oneself (non sui compos). With the completion of the seventh year, however, a minor is presumed to have the use of reason.
Can. 98 §1. A person who has reached majority has the full exercise of his or her rights.
§2. A minor, in the exercise of his or her rights, remains subject to the authority of parents or guardians except in those matters in which minors are exempted from their authority by divine law or canon law. In what pertains to the appointment of guardians and their authority, the prescripts of civil law are to be observed unless canon law provides otherwise or unless in certain cases the diocesan bishop, for a just cause, has decided to provide for the matter through the appointment of another guardian.
You’ll need to find something that says The Church speaks for minor children over the parent. You won’t find that. You’ll find just the opposite. If you told your child not to do something and the Church turned around and said Don’t listen to your parents do it anyway, that would violate the law of God to honor your mother and father, the Church does not do such a thing. You are simply mistaken. We can let this rest now, don’t you think?