Welcome!
What issues, in particular, would you say are most prominent right now? It is difficult to answer an open ended question like "how do we help him?" so we kind of need a place to start.
How is his pragmatic language?
Is he having severe sensory issues or meltdowns?
Does he have self-calming habits or odd repetitive movements and how do the people around him treat those?
Does he have issues with fine or gross motor control that are causing him issues?
What are his interests?
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).