The parents probably put effort in, but not enough, and not in the correct manner! If they want to get therapy, then they should have forced for some decent therapy that could work, such as... oh my god!! !... contacting a psychologist who specialises in autism???? Oooh what an idea!! !! !
It took them so freaking long to actually think "hm. It might be autism. Let's go and do loads of research and get into contact with experts on autism" etc etc...
When I was diagnosed with AS, my Mum did all the research, i.e. printing stuff off the internet, and my school gave us four different books on it!!
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I am a partially verbal classic autistic. I am a pharmacology student with full time support.