MiniMax M2
Sally has 3 brothers, meaning there are 3 boys in the family.
Each brother has 2 sisters. Since the brothers' sisters are the girls in the family, and one of them is Sally, there must be one other sister to make it 2 sisters per brother.
Therefore, there are 2 girls in total: Sally and one other sister.
From Sally's perspective, she has 1 sister (the other girl).
Answer: 1



