Do you have any brothers or sisters?
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I have a brother and a sister.
I answered according to the film I watched here on busuu
I guess most English speakers would say I have "a brother" rather than "one brother".
However, this question enquires about the number of brothers and sisters there are.
A perfectly correct answer would be, "I have two sisters and one brother".
In the answer you gave, "one" is not wrong...but it is the less used of the two options.
thanks again.. it's so nice this comment from you...