Ditto for my parents. However, I'm completely comfortable with the claim that my great, great, great, great, great, great, [snip 500,000 "greats"] great, great, great, great, great, great grandparents were a lower species than human.
I know for a fact that I'm taller than my parents, and even taller than my grandparents. I also know that I have more education than my grandparents and my mother, though less than my father.
Just what is the problem? Why this obsession with whether your distant ancestors were "higher" or "lower" than yourself?
Then don't argue.
---max