I had a different but related experience years ago--when I kept thinking a relative's child must have a learning problem or low IQ, bc my only early/young child experience was with my first born son, who did pretty typical HG stuff, though nothing prodigious.

Turned out, the child is likely high average-moderately gifted. Guess which child has enjoyed school, done very well academically, is athletic, musically talented, popular with peers and teachers, and generally well-adjusted? (rhetorical)