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My mother is my father's wife . My father is my mother's husband . My mother and my father are my parents . Mr Smith has got two children : a son and a daughter. My mother's sister is my aunt . My father's brother is my uncle . His brother has got two sons. They are my father's nephews . My father has got a sister, too. His sister has got one child , a daughter. So, my father has got a niece , too.