Why don the parents just tutor their own children with skills?
It would be the same reason that physicians don’t treat their own family members. It’s just not as effective because emotions are entangled into the process. Kids listen better to other people, specifically teachers, tutors and support personnel, especially those they can have an emotional connection with and can speak freely with the student. The emotional connection is often overlooked. A good tutor should always learn how to relate to the student BEFORE they attempt any type of educational training.