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Testing others will always be beneficial though certain half/full relative scenarios can still be unclear if the shared cM amount falls in the overlap that could apply to both options.

I have several close cousin matches that fall into the overlap zone, some nudge closer to being full, some are more likely to be half and some are right in the middle. I identified a group of matches that only match me so the balance was shifting towards half cousins but that would contradict all the documents and certs I've gathered over the years. A couple of paper trail 1c's are still around and I was able to target test them in the hope of finding the answer, one came back at 600cM which is an awful amount as it's in the overlap zone but the other came back at less than 350cM  which can only apply to a half 1c. I then started to compare them with each other and proved they are all full relatives to each other. When taking everything into account (including that mystery group), I was able to prove my parent is an NPE.