Hello, understandnow &

I'm so glad you found us! You are in the company of lots of parents who are in the same boat that you are in, and who have dealt with the same sad behaviors in our own relationships with our offspring... .
It sounds like you are learning a lot and starting to get a good handle on how your son's mind works, and what you can do to make changes to your communications with him to help make things better. Please remember to check out the links to the right-hand side of this page to supplement what you've already learned

I've dealt with the Silent Treatment, also, and in the past (before I learned the valuable tools of detachment, not taking these behaviors personally, and Radical Acceptance that this is how my BPD loved one just is) that would truly make me feel wounded and hurt, bordering on angry at the unfairness of the treatment. I'd follow him around and plead my case, making the big mistake of JADEing:
Justifying myself,
Arguing my point,
Defending myself and
Explaining myself. I found that engaging him like that would just make things worse, escalating the situation; JADEing is a NO-NO
At this point--after finding this site in April of 2013, after my adult (now 38) son was diagnosed with BPD--I've found that my best response to the Silent Treatment is to depersonalize it and ignore it, but in a loving manner. Sounds weird, because I do still feel wounded by this treatment, but I detach in a loving manner (my body language, words when I have to use them, etc.) until it is over. Something I've found is that since I've been doing this, not only does the timeframe go quicker for me (since I'm doing my own thing and not ruminating over figuring out how to "get him to talk", but it actually does end up ending quicker too.
When there are grandchildren involved, it hurts even worse... .But you can get a handle on this and hopefully the timeframe won't be as long as in the past. I think, rather than look at it as letting him stay away with no contact from you, maybe try to act normally? Like, if something comes up and you need to contact him, do it in a loving manner. If you don't need to contact him,
don't contact him, and do
that in a loving manner, too (if you know what I mean). You be normal, and loving, when you finally see him or talk to him or need to contact him.
This is what has worked for me... .What do you think?