Son (asd and adhd) doesn't remember when he's misbehaved.

[Chattycatty]

As the title says my ds11 doesn't remember when he has done something wrong.

For example he tore up a friends drawing his friend was upset naturally and didn't want to be his friend. My son was upset about not being friends and said he didn't know why. I asked the other boys mum and she told me about the drawing my son was adamant it hadn't happened and genuinely didn't remember when it was obvious it had happened.

This has happened again since where he has misbehaved but doesn't remember the situation surrounding it at all. Is this a common thing with people with asd or adhd and how can I help him understand what he did was wrong when he doesn't remember doing it.

Sounds like his processing and short term memory, very much like my DS. The best thing I think would be to make a social story about the behaviour (e.g. tearing up someone's drawings) and explain why it's not a great thing to do because it hurts someone else's feelings then read it with him neutrally and make no reference to the incident itself.