I have heard of times where yeshivos have children who they try to protect from their homes. Children who they have accepted and deal with even though they do not get paid and they are not typical. Those are children who, nebach, are in dysfunctional families. These are children who have to be protected from home. Every other instance and every other yeshivah very much work and understand that parents are more than just partners in teaching children and in school and life lessons.
If you find that the school is trying to keep your children from being influenced by the home, it is probably for a good reason. VDAL