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Seven.

7

Mom -- 1
Dad -- 2
First Daughter -- 3
segundo Daughter -- 4
Third Daughter -- 5
Fourth Daughter -- 6
Brother -- 7

They are sharing a brother.

ten!!!

10? x)

7, they all share a brother.

s e v e n . ; )

7

We don't know. They could have grandmothers and aunties and uncles we don't know about.
But if there's only that many people in the family then 7, mother, father, 4 daughters and they all share a brother. That makes seven.

7.

tu nearly tricked me there. :)

7.

10 people idk not great at math(:

7