It's in the Friends folder. If you see the thread title at the top, try clicking on that and maybe you'll be able to view the whole thread.
The shunning rules have changed over the yrs. I think the current rule is no unneccessary contact with relatives not living under your roof.
The process of getting your status back is called reinstatement. Here are some search results for shunning. If that doesn't answer your questions, come back and we'll try to help.
Your son will be discouraged from having lots of contact with you, since you're not JWs, but there is no rule stating he can't have any contact with you at all. If that happens, you can try to reason with him by telling him God wouldn't want families destroyed. It may not happen though, let's hope.
IMO your quiet approach is very smart. Challenging his beliefs too much will just fuel his belief that all non-JWs are being influenced by Satan to destroy their faith. Saying a few things is fine, even btr, put it in the form of questions. More info here.