What does "second cousin once removed" really mean, anyway?
The chart below, by Alice J. Ramsay in 1987, may help answer that question. In it, relatives of the same generation appear on the same horizontal line, while parents and children are arranged vertically.
It turns out that "once removed" isn't that hard to understand -- it means "one generation removed." So your first cousin once removed is simply the child of your first cousin.
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