We see illustrations of family trees, but your tree is really so much more. Think about this. The Scriptures tell us that Eve was the mother of all (Genesis 3:20), but we know the Great Flood cleansed the planet about 4500 years ago. The only survivors were Noah and his wife, and his three sons and their wives. So if each one of them had only three sons, and each of their sons had three sons, on down the line. Watch this video to visualize how quickly one man and three sons can populate the planet:
See also, the opposite end of the spectrum, just how many grandparents are in your tree?