Hey Dede
I contacted my mom after 8 years of totally shunning her for years of painful rejection/shunning from her. I had finally had enough. Its been a few months since I got back in touch with her - and it has been okay. It has been very important for me to set boundaries - No guilt trips, no shame, no condemnation, no lying. If she talks JW she will get anti-JW right back. And we ONLY do email and letters. I haven't even given her my phone number. Its just so much harder to keep boundaries and not get sucked in to a negative discussion on the phone. If she can behave for several months - I would consider letting her call me. That's just my experience.
Have you read Releasing the Bonds? Hassan gives some good pointers. One thing he says is that as long as they are alive there is hope.
Your mental health and peace of mind should be #1 IMO. Do whatever YOU feel is right for YOU. Not what you think you 'should' do for him.
Good luck to you!! I know it really sucks sometimes.