[MaxPower]

I'm sure all that stuff is true, but I don't think it is true in my family.

Whenever there is any article or scientific study on differences between groups of people, you need to consider that usually the differences within a group are usually larger than the differences between groups.

For instance in the study cited in the article there was a 3 point difference in IQ scores between 1st born and 3rd born people. So while it is true that 1st borns may have a higher IQ on average, there are still large number of 3rd borns who are smarter than there 1st born siblings.

Disclaimer: I am third born in my family and I am the tallest, probably have the highest IQ (can't be sure), and probably make more money than my oldest brother. I am considered the funny one though.