Those parental stories horrify me. All the sympathy.
I am lucky inasmuch as my parents are loving and supportive and have always been so. Unfortunately, I was unlucky inasmuch as I was misdiagnosed as a kid, and was literally only diagnosed as having ADHD in the past seven months.
As a kid, I had a tendency to find something that interested me and just ignore everything else—including, sometimes, sleep—to do that thing. Reading, writing, coding, tinkering with electronics, etc. This would happen instead of my chores, sometimes instead of actually coming to dinner, etc. Meanwhile, things like chores or homework were really hard for me to get started (yay executive dysfunction!) until the eleventh hour, at which point I would work in a panic-induced state of intense focus.
When I started to suffer some fairly severe depression as a teenager, my parents found me a psychiatrist. Psychiatrist went "Well, depression and hyperactivity? The hyperactivity has got to be hypomania, so clearly this is a case of bipolar disorder!" So I got treated for that, medicated for it, but the medication never seemed to work that well; I kept wrestling with depression, and eventually I got taken off the medication because if you stay on depakote long-term it has Bad Effects.
Flash forward to now. Last year I suffered a massive streak of depression and went back to a psychiatrist again. The psychiatrist talked to me about the previous diagnosis and went, "Really? I don't think that sounds quite right for bipolar. That intense focus sounds a lot more like ADHD hyperfocus to me. Have you ever been tested for ADHD?" When I said I had not, he gave me a worksheet to fill out and made me take the excruciating QbTest (which checks concentration, head/eye movement, etc.). When we got my results for the QbTest back, he said the results were borderline ADHD. So he diagnosed me as mild ADHD (and having developed coping mechanisms), along with clinical depression.
The psychiatrist told me I should probably try a couple informational organizational systems to manage things, but he didn't think it was severe enough to need medication. (He did medicate the depression, which was desperately needed.)
About three or four months later we were talking about something else, and he went, "You know, let's talk about that ADHD diagnosis again. Because having worked with you for a while now and given this executive dysfunction situation we're talking about, I'm beginning to think I may have misdiagnosed the severity in that first session. You mentioned you used a few coping tricks to focus during the QbTest; can you tell me exactly what you did?"
I noted that I'd been jostling my foot to keep myself from fidgeting, that I'd dug my fingernails into the palm of my hand (because when I do that, I find it makes it harder to have my thoughts wander; I do this during meetings), and I had tensed my shoulders to keep myself from looking around and letting my mind wander, and after about a minute I had devised a mental trick to let me remember the color/shape combinations so as to not miss many.
Psychiatrist goes, "Yeah... in light of that, I think I'm changing my diagnosis: you are just flat-out ADHD and have developed a number of coping mechanisms. Let's start discussing medication."
So... now I'm doing medication trials to figure out what medication works best for me! Whee?