I just happen to have landed on a bunch of threads by parents with 'gifted' children, and one or two about parents who think their kids are more gifted than they are.
It's reminded me of an 18-month-old I once met, who talked more eloquently than most 7-year-olds can. He had a very enquiring mind, asking intelligent questions (I was at work) and telling me about stuff he'd learned. He could read and was good at arithmetic. He was a little charmer, really, a delight to meet - if somewhat wearing; he never stopped asking questions.
He evidently had the mind of a toddler despite his advanced skills. He was quite physically developed, though still within range for his age. His mother told me her biggest worry was that people couldn't help treating him as if he were older, expecting him to be more responsible or experienced than he was able.
One of my nephews suffered from this as a young child, too - nothing like the prodigy I've just described, but he was verbally advanced due to spending nearly all his time with adults and was also big and strong for his age. Kids shouldn't have to keep telling adults "I'm only three, I can't do that!" but he did have to.
I sometimes wonder how Prodigy Child turned out. His mum said she was prepared for his development to slow down until others caught up, but lifetime prodigies do exist and I don't think they always have an easy time.
Have you known any DC like this? What happened to them? Alternatively, feel free to share about the deluded parents of normal children you have known!