Oh dammit, have made a sort-of pun on my name. Not intended, at all.
Anyway. I can well believe that some people claim that their child has whatever when it could be solved by better parenting, BUT, on the other side of the coin, there are people who go into denial about their children's neurological conditions, and blame additives/spongebob squarepants/"the system not being able to cope with bright people and just labelling them".
Also, some people claim all kinds of easily-testable conditions that they don't have, but we don't let it affect our perception of the condition because it's obvious to us laypeople that they're malingering.
For example, my mother collects medical conditions from the media. Over the years, she has claimed many things, including, but not limited to the following:
Reynaud's Phenomenon (and claimed I had it too- no, she was just too poor to turn up the heating. Is a difference),
Asperger's Syndrome (may actually be true, but she's not claiming she has it because of an understanding of the condition!),
IBS,
"Early Menopause" (I looked this up, and she does not qualify- she apparently expected to be fertile until 56. Anything before this is early, according to her, and bolleaux to medical science!),
and the latest is A Slipped Disc. But she hasn't asked her doctor about it, because, "They won't do anything, so there's no point. Cost-cutting NHS". Entertainingly, a friend actually has had a slipped disc recently, which has now been operated on. And she's now back at work.
Repetitive Strain Injury/washerwoman's thumb