There is no single normal question which will guarantee that response. The best you can do is: How many sons do your parents have? Which one are you?
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My question was not on the context of primogeniture or about any legal vocabulary.And my comment on primogeniture was not directed to you, Dileep. Unfortunately, threads do not always obey the injunctions of their progenitors, but can wander off in umpteen directions with the vagaries of the discussion.