I found this to be a good article on explaining all those wacky first cousin, second cousin, once removed, twice removed relationships - plus, there's a downloadable chart.
Cousin Chart—Family Relationships Explained by Family Search
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To see this working, head to your live site.
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I find this chart useful: https://dnapainter.com/tools/sharedcmv4. While it is interactive for DNA match comparisons, It clearly identifies how the cousin relationships fall, as well as 1/2 cousins.