Can you help me comprehend what this sentence means?

"Today most psychologists agree that the majority of adolescents have accepted values and standards of their parents and society, and that friction between the generations is only slightly higher than that of childhood."

What I am confused about is that last part: "friction between the generations is only slightly higher than that of childhood." What the heck does that mean?
This is from my human growth and development class.
Can you help me comprehend what this sentence means?
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