親の欲目と他人の僻目
Meanings
1
parents overvalue their own children but undervalue others'
Proverb expressing the common bias where parents see their own children through rose-colored glasses while being overly critical of other people's children.
See also: 親の欲目 (おやのよくめ)
Due to parental bias, one's own child seems like a genius, while other people's children are seen as nothing special.