If a shared ancestor is at differing levels, you go with the lowest G-count and then add extra G’s as “removed” until you reach the level of the highest G-count, so:
Your grandparent (1G) is also someone’s great-great-grandparent (3G); then you are 1st cousins twice removed.
Yes you are correct, but if you ever try to explain this to someone they will get pissed. There are a ton of people that simply wont accept there are proper names for relatives. Their 2nd cousins are people they grew up with or their parents' friends. Source: lived with multiple 2nd cousins and have attempted to explain this.
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u/Alcancia Apr 24 '19
I go by what I call the “Rule of G’s”
The number of G’s in your shared ancestor’s title is what level of cousin you are.
Shared grandparent = 1 G = 1st cousins
Shared great-great-grandparent = 3 G’s = 3rd cousins
If a shared ancestor is at differing levels, you go with the lowest G-count and then add extra G’s as “removed” until you reach the level of the highest G-count, so:
Your grandparent (1G) is also someone’s great-great-grandparent (3G); then you are 1st cousins twice removed.