Chickie,
Ohhhhhhhh, how I hurt for you. I know you love your ds and gc so much that you would pay ANY price to have them in your life in a healthy relationship. But the truth is, there is no price you can pay b/c you have no control over what other people do. You could offer your very life to have a good relationship, but if they don't want it, your life would be given in vain.
If you just can't bring yourself to cut them out of your life, I have a story to offer:
My sister and her husband had problems with their dil and ds for a couple years and it caused them terrible suffering. They wrote emails and a letter to them, but it didn't help b/c they were writing it from their own perspective. After much defeat and despair, my bil wrote them a letter asking their forgiveness - saying that he had failed as a father, etc. (My sister and bil are fabulous parents and always went the extra mile for their children. They would do ANYTHING for them.) Do you know his dil called him to say that they received his letter and she was NICE to him. It was a turning point in their relationship. No, they will never rank up there with dil's parents, but at least they are in their lives. Last night I used that tactic with my son. I had a rare opportunity to speak to him one-on-one and I told him that I felt like a failure as a mil - that no matter how hard I try, I manage to mess things up. Do you know that he actually said, "Mom, you are doing fine". I told him, "No, I think everything through before I say it, but I still mess things all up. I feel like such a failure." We talked for about 20 minutes and he - hold onto your seat - told me he loved me before we hung up......before I had a chance to tell him I loved him. Maybe there really is something to asking for forgiveness even if you have done nothing wrong in your eyes. That's the approach Creme used, too, and it worked for her. I know it might seem absolutely crazy since they have offended us so, and we have given and given but if it's possible to offer that up and it is accepted by them, it could be a good new beginning. Have you already gone down this avenue?
Love you to pieces, Hope