A favored or favorite man or boy: the latest ''fairhaired boy'' of the musical world/ the white-haired boy of the happy family
A man destined for and being groomed for principal leadership or other reward; comer: A job had to be found for Patten, the blue-eyed boy of British politics( first form 1918+, second 1924+, third 1923+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with fair-haired boy
A favorite, a person who is given special treatment. For example, Today the attorney general is the governor's fair-haired boy. This term alludes to the preference of blond (“fair”) hair over dark hair.
[ Late 1800s