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It's not that I'm wholly unfamiliar with how the axiom Children should be seen and not heard works in practice, it's just that it, like many Chinese/ dragonish/ royal customs, is contra-intuitive and has to be thought through: partly because my Sino-Japanese dragons have respect levels in their language and English doesn't. Young dragons attend their father at table to learn the customs of gentlemen and do not take part in the conversation of whatever other adult relatives and guests are present. If your royal father addresses a question to you, you answer in the polite fashion you normally speak to him in. What do you do however when your royal and somewhat unconventional uncle asks you a question? Request Papa's permission before answering or not?
(There /are/ worse ways to spend time before work than this. Paying bills, for instance.)
(There /are/ worse ways to spend time before work than this. Paying bills, for instance.)

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(Now suppose it's /Father's/ uncle who asks the question. Hmmm.)
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If the uncle if father's younger brother, then
1) one looks to one's father first, either subtly if older or openly if younger. The problem with this is that looking to one's father, depending on age and how it's done, can be proper filial behavior or can be a open slap at the uncle
2) one wonders what's up with the uncle that he asks a question in front of one's father which puts one in doubt as to whether one should answer (in front of one's father)
3) hope like hell one's father answers for one if the question is at all politically sensitive rather than just quirky
In general, I think deference to parent doesn't completely trump deference to family. So if it were father's older brother, father's uncle, or father's father asking the question, the behavior and the interpretations of the behavior would be somewhat different.
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Remember that Papa is also the high king. I've always assumed this meant a certain balancing act when Papa's uncle is around- respect for the senior generation balancing the courtesy due a king.
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The old Chinese have this lovely habit of pausing in their conversations. American conversations tend to run onto the tails of each other sentences, every one is so eager to participate and express their opinions. Chinese do that too, but there is another way where one pauses decorously in speech to give the others a chance to say something and one pauses decorously before answering a question, as if the question was of great import and deserved a deliberated response.
Something like that would give a child time to gague reactions and still maintain proper courtesy? See that huang mei opera, if I recall correctly it does the pause and then speak thing rather nicely.
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The only iffy part might be that it's Goushou who does the asking rather than Goukou, but that's Goushou all over. I did wonder if punctilio required some tacit permission from Papa to speak when asked a question by someone else; and clearly it does.
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(*ahem!* Before a lecture swings into gear about relative cultural mores, these are meant For Your Amusement, not For Your Information.)