I can see so much in what @Jellycats4life says. I just didn't face it until child was about age 9. I just don't understand what was happening for me.
I have one child, I'm NT. I saw they were different and instinctively knew it but didn't consciously know what was going on.
I already felt blamed, judged and it was awful. Not one person supported the possibility and openly said ' yes I think your child is ND'. It was a headteacher who dropped multiple significant hints. I had to pay for the assessment because the SENCO said no problem here and no one would provide supporting evidence. My entire experience as a mum was not enough! The NHS refused to assess. I was gaslit everywhere.
So this experience can feed into a parents denial or inability to really ' see'. One other ND mum, when I asked her, said yes, he's different. I really appreciated her saying that to me. Then I was a dog with a bone and would not stop until we got the money together for the assessment. Not fair I know but I knew it was vital.
My child knows who he is now. It explains so much. He might not like it but we now have truth and reality. I'll never listen to one more parent blaming comment again because I know now this isn't what I did 'wrong'.
We need this now we're at secondary school. Will it open lots of doors? Not as much as hoped but it has been important when we've had issues ref other's bullying or quirky behaviours in school.
What if we have criminal justice issues down the line? This is important. What about social support in multiple arenas, again this is important.
Out of all though, the most important thing is my son knowing who he is and me knowing this also.
If there are no 'problems' cropping up then I can understand that a parent might just not see it.