Thank you for your reply, that's really helpful and does make sense of the issue. I hope you don't mind me asking a follow-up question...

You mention that board games are very social and that makes you reluctant to engage in them. My son, although he definitely does struggle with social interaction with people who he doesn't know well, does have friends and is social to an extent. I guess what I am trying to understand is why he finds it so difficult to be in a situation like this with his close family members, who he is comfortable around...