Are parents the best teachers?

Today, I would like to try to write about following TOELF example.

"Do you agree or disagree with the following statement? Parents are the best teachers. Use specific reasons and examples to support your answer."

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I disagree with this statement due to 2 reasons.
First, there are many good teachers besides parents. For example, a supervisor of a university might be the best teacher. In my case, my guidance professor was a great researcher. I learned a lot of things from him such as the attitude to work on research, a way of thinking about family, and so on. He is the best teacher of mine. Similarly, other people may think a person who is not their parents the best teacher.
Second, there are many bad parents in this world. For example, much domestic violence happens in Japan. I think it is almost impossible for these parents to be good teachers for their children.
In conclusion, the best teachers depend on each child.

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128words, 20min