According to this passage which relationship has the greatest influence on a childs mental health

Parents

Explanation:  Parents greatly influence children's behavior through discipline, such as how to teach character, self-control, and acceptable behavior.

Induction-based discipline is generally more effective. Temporary withdrawal of love and affirmation of power is less effective of all techniques.  

The internalization of parental teachings depends on the degree of precision in the perception of the message and whether it is accepted or rejected.

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