We don’t know about you, but we were never really clear on what “second cousin, twice removed” really means. But just as you’re headed for a big family gathering, Nathan Yau of the blog Flowing Data has created this chart to decode these complicated family relationships.
The chart looks a little complicated at first, but all you have to do is figure out what common ancestor you and the relative in question share. Let’s say that your great-grandfather was also their grandfather. If you match up the entries for “great-grandchild” and “grandchild,” you’ll see that you are first cousins, once removed.
Here’s one more way of visualizing those relationships, designed by Alice Ramsay in 1987.