" as asking about the content of the communication. The second answer seems unhelpful. Also, in reality one would not repeat so many words of the question.
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GPY"What did you write to your father about?" is arguably preferable, however.Though, actually, the meanings are not identical. "What did you write to your father about?" is asking about the general topic. "What did you write to your father?" could be used to ask for more detail when the topic is already known.
TomJ1) Shouldn't there be an 'about' in the question asked by 'A'? Shouldn't it be like this: 'What did you write to your father about?'Yes. That's correct. Nevertheless, it's common practice to omit "about". The listener will understand that you don't mean that you want the answer "a letter" (because there's almost nothing else it could be anyway).