co-cousin-niece-in-law

The granddaughter-in-law of one's parent-in-law's sibling.

My co-cousin-niece-in-law is a good person.

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first co-cousin-niece-in-law

The granddaughter-in-law of one's parent-in-law's sibling.

My first co-cousin-niece-in-law is a good person.