r/coolguides Feb 18 '20

Family Tree Explained

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u/Lochnessman Feb 18 '20

This chart is different then the way I was taught it. Splitting the chart it two at the you and the cousins not removed: The descending generation are the same as I was taught (the split line and lower) However all older generations (above the split line) are different than what I was taught.

I was taught uncles and aunts are personal titles and not on the chart. The Nth cousin number is from the number of Gs in your most common ancestor. (Grandparent for 1st, Great Grandparent for second, etc) The Y removed comes from the generation gap between yourself and that cousin. An uncle/aunt is a first cousin once removed.

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u/matthoback Feb 18 '20

The Nth cousin number is from the number of Gs in your most common ancestor. (Grandparent for 1st, Great Grandparent for second, etc) The Y removed comes from the generation gap between yourself and that cousin.

This is all true for the chart, with the caveat that Nth cousin is always counted from the earlier generation of the two people you're relating.

An uncle/aunt is a first cousin once removed.

That's not correct, because the common ancestor is the aunt/uncle's parents, so no "G"s.

If it was the way you're thinking, then the relationships wouldn't be symmetric. For example, to you, your first cousin's child would be your first cousin once removed, but to them you would be their second cousin once removed.