Actually I don’t believe it is a legitimate question. The person knows because he knows. In the gemara they refrence many times from diffrent places. How do they know there? Whether or not you liuke “your fathers” type of answers they are still legitimate answers. Maybe he knows because from last year. Remember even though the 4 types of people who ask are usually shown as children they are referring to everyone so the guy can just as easily be 40 years old.
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