some people think parents are best techers,do you agree?

Not the best,but the most important.

Yes,I agree,it's one of the greatest minds for teaching children.

Yes,of course.
1.We spend more time with our parents. Thus,they have made more impact on us and we learn a lot from them, such as their behaviours, triditons,minds , etc.
2. We have the closest relationship,including the blood relationship and the one in our life.

no,some parents who carrying the bad habit may give passive effect to their children