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How Many BROTHERS AND SISTERS Are there in a family?

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How Many BROTHERS AND SISTERS Are there in a family?
A family I know has several children. Each boy in this family has as many suters as brothers but each of
the girls has twice as many brothers as sisters. How many brothers and sisters are there?

Solution :
Since the boys have as many brothers as sisters, there must be 1 boy more than the number of girls. If we try 2 and 1, 3 and 2, and 4 and 3, we will find that 4 boys and 3 girls is the solution to fulfil the requirement that each girl has
twice as many brothers as sisters.

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