My father is PG in math and science and my mother is average in those subjects. I ended up average to maybe a bit above average in math and science - definitely beyond 10 points below my dad. My sister is better at math than I am and so is my brother. My dd, on the other hand, seems to be very bright in math....not as much as my father though. We figured SOMEONE had to get at least some of his brains somewhere along the line.

(My dh is also pretty average with LDs).