Three-Generation Family Tree Generator A three-generational tree is focused, as it helps you highlight the most impactful relationships and is easy to follow. Microsoft Excel's built-in template ...

RENEE MONTAGNE, HOST: And now to what's considered the largest family tree ever scientifically mapped - it stretches back five centuries and includes 13 million people over a span of 11 generations.

From many smaller family trees, the interconnected profiles converged into one massive family tree of 13 million people, spanning an average of 11 generations.