So is it Aspergers or Autism?
And many if not most 11-year old boys do do shit like that. They eventually grow out of it. (When they have kids of their own
) It's not unreasonable for the grandparents to want to believe it's something he'll grow out of. It was around round 13/14 with my elder son, younger one is showing signs of improvement at age 12 but we have a way to go.
And who doesn't behave for grandparents to get what they want? Aspy and Autistic kids for a start.
Did you explain to him exactly why he can't ride his bike? What were the ground rules you laid down about that? Did he willfully ignore them or could they have been open to a different interpretation than the one you were intending?