Various languages have different terms for the same word or relationships. For example, in Swedish, they call their mother’s brother “Morbror” and father’s brother “Farbror,” whereas, in English, they are called uncle.
What do you call the daughter of your sister?
Various people get confused as to what to call their sister’s daughter. The daughter of both your sister and brother is called niece. In fact, their son is also called your niece, and you would become their uncle or aunt, depending on your gender. (See Why Instagram is bad for relationships?)
Members of the tree