What is 4.5-tuple-third-cousin?

4.5-tuple-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and nine great-great-grandparents in common.

My 4.5-tuple-third-cousin is a good person.

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4.5-tuple-third-cousin - meme gif

4.5-tuple-third-cousin - video