It is possible for someone to be both a niece and cousin to the same person if their parents are siblings, and those siblings marry individuals who are also related to each other. For example, if person A has a brother who marries person B's sister, then person A's child would be both person B's niece and cousin.

This situation is called double descent, which occurs when individuals inherit genetic material from two distinct ancestral paths. Double descent is more likely to occur in small communities or populations where individuals are more likely to intermarry.
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