Mary Elizabeth O'Connor, an aunt to Family Tree columnist, John P. O'Connor, is shown here in a photo from her wedding day that was published in 1938 by the Springfield Daily News. My previous two ...

THE SECOND GENERATION: Henry O. Partin, 1881-1971, son of Stephen Partin and founder of the Heart Bar Ranch. Married Bertha Bass, a rancher’s daughter, who still lives at the family homestead.

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.

On Thursday, Erlich’s insights from that data set appeared in the journal Science, in the form of an enormous family tree of 13 million people, a picture of marriage, migration, and human ...