blue-eyed boy

(sb's) blue-eyed boy{UK} AND (sb's) fair-haired boy {US}(Used about a boy or man who is treated better than anyone else by his teacher, employer, or parent, because they think he does everything right and do not notice his faults) — любимчик

Example: My brother was always the blue-eyed boy of the family, I never could compete.

also
[teacher's pet]