They're probably just trying to make conversation, and they latch onto that because people are much worse at conversing than they think they are, and the vast majority tend to latch onto the most obvious things to talk about, which can have a way of encroaching onto what you or I might consider our private lives.
As far as problems with 'only children', I think that's more a problem with over-attended-to children, over-spoiled children, and over-isolated children. Parents just have tendancies to create this situations moreso with an only child than with multiple children.
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"Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions." - Albert Einstein
"Wise men talk because they have something to say; fools, because they have to say something." - Plato
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