High achievers, you firstborns stayed in Mom and Dad's good graces -- while using your superior size to boss younger sibs around. You may have slid into the role of surrogate parent, which gave you a respect for authority and a sense of responsibility.
MIDDLE
You realized you couldn't outmuscle the oldest kid, or simply act cute, like the family baby. What you were -- and still are -- good at: mediating between warring factions.
LATERBORNS
You resisted copying your older sibs -- who wants to feel inadequate? Instead, you carved out your own space by trying new things: maybe playing a musical instrument, or developing a distinctive sense of humor. Since your parents already had their hands full by the time you arrived, you grew up less invested in authority: the perfect setup for rebellion and risk-taking.
ONLY
As the oldest and the youngest, you've got it all. But because you identify closely with your parents, you often have more in common with firstborns than rebellious laterborns.