The only thing I can come up with is: suppose woman's mother has a sister, the woman's aunt, who has a son. The son is then the woman's cousin. Then suppose the woman's aunt passes away, and the woman's uncle then marries the woman's sister.
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The only thing I can come up with is: suppose woman's mother has a sister, the woman's aunt, who has a son. The son is then the woman's cousin. Then suppose the woman's aunt passes away, and the woman's uncle then marries the woman's sister. The male cousin is now also her nephew - sort of - the son of her sister and her husband, although not the actual child of her sister. Then that son
What's the context? Are you sure it's not talking about more than one person?