As categorical guidance, that seems like a problematic thing to teach. First, parents don’t know everything, but they know their kids and have witnessed their journey, so they have a unique perspective to offer. Second, parents will begin to (justifiably!!) grow suspicious of your institution and develop resentment, which is a serious structural problem.

Hopefully what you mean is something like you teach them to think critically about their parents advice as one input among many, understanding where the advice comes from and its inherent strengths and flaws.