The easy way to remember is to “count the G’s”.
If you share a grandparent- 1G=first cousins, share great grandparents 2G’s= 2nd cousins.
If there’s an uneven number of G’s the difference is the “removed”. So if your grandparent is their great-grandparent, you share one G making you first cousins, but they have an extra G making it first cousins once removed.
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