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When your niece becomes your sister after your parents adopt her.
My sister has real issues, and my parents have to adopt her daughter. Now I have a nieceter.
by Uncle Bro June 18, 2010
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2
When your niece is a product of incest between your sister and your father.
He was shocked when he found out his niece was fathered by his father, she is really his nieceter.
by gardenmyway December 28, 2015
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