I've by any and all accounts had an extremely privileged, happy and stress-free childhood/life, and I'd still balk at this kind of interrogation. It's just plain inappropriate to ask something like this of anyone in a professional setting, people's life stories are simply of no relevance to the job and more importantly, nobody else's business.

Not to mention the minefield of discrimination avenues present here, conscious ones and otherwise. Hell, even a positive feel-good story about a happy life could lead to a negative reaction depending on who's hearing it, these sort of things are inherently perilous to talk about in professional settings.