"My sister skipped a grade" tells the story of all the big brothers whose parents have ordered them to "take their little brothers" with them a second before they leave the house - and the story of the little brothers who were dragged after the big ones for their adventures. Age differences, mentality, and ways to bridge this gap.

So what's more important at school: good friends or good grades? Concentrating on your studies or making sure you match colors? Sometimes, as the sisters discover, the answers are actually in the middle.