How many people in the family tree would it take for you to exist?
Within five generations, 62 people would have been necessary for you to exist. Going back thousands of years, the amount of ancestors you have quickly reaches the millions.
from CGP Grey
Key Facts In This Video
For every "G" in a relative's title, there is one generation in between you and that person. (0:14)
Your first cousins and you connect at a grandparent, whereas second cousins share a great-grandparent. (1:49)
Here's what it means to be "once removed": (2:26)