Give the step-by-step reasoning process and then the final answer. Nick is 13 years old. His sister is 6 years older and their brother is half their combined age. How old would their brother be in 5 years?
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Nick's sister is 13 + 6 = 19 years old. Their combined age is 19 + 13 = 32 years old. Their brother is 32 / 2 = 16 years old. In 5 years, their brother would be 16 + 5 = 21 years old.
The final answer: 21.
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