It's a well known problem[0][1] with accepting parental assertions around their child's health. That's why kids are often given time alone with their doctor, to express feelings they wouldn't otherwise feel comfortable about. Additionally, it's been shown that a parent is not great at objectively evaluating their child's emotional state or place in the world. [2]

It's even got an entry in TVTropes![3]

But why would you have a "sorrowful empathy" because I have a passing knowledge about childhood and children? You can't seriously think you're going to always know what your children are thinking or that they're even being entirely straightforward with you now, can you? Surely they have their own lives by now even a little bit, some space for their own that you're not involved in and don't know about.

[0] https://pubmed.ncbi.nlm.nih.gov/15473508/

[1] https://archive.nytimes.com/parenting.blogs.nytimes.com/2009...

[2] https://www.psychologytoday.com/us/articles/201407/parents-j...

[3] https://tvtropes.org/pmwiki/pmwiki.php/Main/DoesntKnowTheirO...

A well known problem? An article saying "Some parents have limited knowledge concerning their children's OHRQoL.", a new york times article, a psychology today article and a tvtropes page? This is extremly light evidence. You can defend anything with a vaguely related study and a few press articles.

I don't personally believe in learning about anything from HN, only of things, so at this point if you want to know more I recommend talking to a pediatrician, as I'm not an expert and may (unintentionally) mislead, misdirect, or misinterpret.

Maybe it's not well known! Maybe it's extremely rare! Maybe I've got biases! Who knows, I certainly wouldn't. You have no idea what my qualifications are, what my expertise is, and generally there are no social consequences for me spouting nonsense, so there are not a lot of good reasons to listen to whatever my argument may be, right or wrong.