I'm trying not to be the "I think my kid is brilliant" mom, but something just doesn't seem right. I had always heard that siblings are normally within 10 points when they share the same parents and background.
My sisters have to be at least 25 points lower than I am.
Possibly 30 to 35. They are just not that bright.
That's just life.
Note: I'm basing this on the difference of 500 points in SAT scores, which, given what I know about them seems right. Same with my father. He's not exactly the brightest bulb.
