Based on the data provided and using logical reasoning, Mr Smith has seven children, four sons and three daughters.
Logical reasoning means using critical thinking skills to provide solutions to given problems.
The number of children Mr. Smith has can be determined by using the skill of logical reasoning.
Assuming that son has two brothers, then he also has two sisters.
Each sister has one sister and three brothers.
This scenario does not satisfy the conditions.
Assuming that son has three brothers, then he also has three sisters.
Each sister has two sisters and four brothers.
Therefore, Mr Smith has seven children, four sons and three daughters.
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