surpassing one's parents
Describes a child who exceeds their parents in ability, character, or achievement. Often used in a positive sense, but can also imply a child who is precocious or too advanced for their age.
He has talent that surpasses his parents'.
That child is beyond his years and already thinks like an adult.
Compound of 親 (oya, 'parent') and 勝り (masari, 'surpassing'), the noun form of 勝る (masaru, 'to surpass').