Plato brilliantly plays Hari Seldon in the Republic, and mentions that under democracy the high will be brought low and the low will be brought high. Fools (children) will demand respect from the wise (parents) and the wise will abase themselves and resent the fools.
Thus under Sophist regimes, parents come to resent their children and children come to hold their parents in contempt.
It seems widely applicable and very significant. Research underway.
E.g. can you think of a single public case of European children genuinely respecting their parents? Maybe it happens privately but it seems almost perfectly deprecated.
I think fostering was invented precisely because children were already starting to hold their parents in contempt.