Second cousins twice removed. The chart gives us a visual depiction of ... dozens of websites and services you can use to trace your family's history - we've all heard of Ancestry.com and 23andMe.

OK, all you genealogists out there. What is a “half cousin”? If you don’t know, don’t feel bad. That’s not a common term, but ...

Today marrying your first cousin is illegal in 24 US states. But for most of Western history, people had to marry whoever lived nearby, which oftentimes meant marrying within the extended family.