At first I was worried about my younger brother and sister seeing this and having their self-esteem destroyed. But, after all, they've been dealing with the reality ever since they were born:
The eldest children in families tend to develop slightly higher I.Q.s than their younger siblings, researchers are reporting, based on a large study that could effectively settle more than a half-century of scientific debate about the relationship between I.Q. and birth order.
The difference in I.Q. between siblings was a result of family dynamics, not biological factors like changes in gestation caused by repeated pregnancies, the study found.
The report says the oldest child is more "dutiful" and "cautious." It doesn't say so explicity, but that would make the younger children more "rebellious" and "reckless." Yep, sounds just like us.