What do you call your sister's children?

Sister's children can be called nephews or nieces, or aunts or nieces. My sister's children call my mother's brother uncle and his wife aunt. Call mom's sister menstruation and her husband's uncle. If you are the eldest sister's child, you should call your sister's second sister and second aunt and your third sister and third aunt. If it is a younger brother, the names should be sorted according to the number of sisters and brothers, such as big uncle and second uncle.

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