Don't give up on your daughters. My father disassociated 10 years before he died. At first I did not have much to do with him, being the good little dub that I was, but as time went on something deep inside of me decided that it was wrong and cruel to avoid my father.
He wrote me a very loving letter shortly after he disassociated himself and assured me of his love for me. He told me that if I ever wanted to know why he did what he did, he would be happy to explain it to me.
About 6 years before he died, he got very sick and almost died. Almost losing him made me rethink my relationship with him. Toward the end of his life I spent a lot of time with him, which I am so glad. I did not start having doubts about the organization until a couple of years after he died, so he never knew about my change of heart.
What I am trying to say is this, let your daughters know that you love them and will always be there for them. Tell them that you know that to be loyal to the organization (and stress that it is loyalty to the organization, not Jehovah) they will have to shun you. Even encourage them to ask the elders to show them from the bible the scriptural basis for shunning. You never know what may become of it.
"By doubting we come at truth" -Cicero