What you find is that as you go back, that you have so many great, great, great.... grandparents. So Edward was born 1020 years ago, which is roughly 40 generations. In that time you "should" have had 1 trillion ancestors. Which is about 10 times more people who have ever lived. Because the same people keep turning up on different branches of your family tree. Especially when you get to about the tenth generation.

Essentially we have so many ancestors that as long you have children and they have children. Your line will continue indefinetly and you'll have millions of descendants.