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ANSWER: There are 4 brothers and 3 sisters in the family.

EXPLANATION: Let b represent the number of boys and g represent the number of girls. The number of brothers each boy has is the number of boys less 1. The number of sisters each girl has is the number of girls less 1. So we know:

b - 1 = g
g - 1 = b/2

Isolating for b gives the respective equations:

b = g + 1
b = 2 × (g - 1)

Now we have:

g + 1 = 2g - 2

g = 3

So b = 4. 3 girls, 4 boys.

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