Call it sibling rivalry, but while this brother and sister are both claiming bragging rights researchers say there's actual proof that first-borns tend to have higher IQs and do better in school.
But try telling that to the babies of the family. While many disagree with the notion that first born translates to smartest, we found a couple of people who admitted the theory rings true.
A new study offers an explanation of why some first-borns may end up doing a little better. The researchers say it's because parents are stricter the first time around.
The study, published by the national bureau of economic research, found tough love and discipline pay off. It found, for example, if a child brought home bad grades, parents would be less likely to punish them if they are later-born children.
But Dr. Nava Silton, a psychologist, says there are any number of reasons why first-borns may do better in school.
"A lot of things to think about with the first child, parents are not reassured that they're having more than one child after the first child, so they might be investing all of their resources in that one child," she said, adding that even if that is the case first-borns don't always come out on top.
"It's been a highly contentious issue," she said.