I tried to solve this using the tree diagram and realized that the speaker is the only child and in this puzzle, he is talking about himself. And "That man" is the speaker's son.
This puzzle was not straight forward for me, I had to relate it with myself, draw some tree diagrams to find some clue. I found that such word problems make us think more critically and it is different from just solving the questions based on certain algorithms and formulas.
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