I'm very close to a person who is a teacher at a private school for "gifted" children. The parents who are rude, confrontational, and unreliable generally have children that are the same way, and who are on their way to failing the program. Interestingly, these parents often are proud of their child's poor behavior.

The parents who are supportive, interested, and reliable generally have children that are the same way, and who are on their way to succeeding in the program. Simple.