GranandAnna
So your son sexually abused TWO of your daughters but you somehow ended up feeling like a victim? Erm - something's really wrong with you and your husband. I would immediately cut contact and keep my children far away from you both - as your younger daughter has rightfully done. Like seriously I get estrangement happens for millions of other reasons but when families try to cover up sexual abuse to protect their family name and in turn protecting the abuser - that I have a problem with. (As most of the society would).
I wouldn't leave my children for half a second in this world to visit with anyone that would want to let the "sleeping dogs lie," when it came to abuse. Such a grandparent would not be worthy of that. For what then would you teach the grandchild when they open up to you about sexual abuse? Would you quicly sweep that under the rug too? And protect the predator? And my opinion may not be the most popular one but support not only means babying estranged grandparents and/or soothing their hurt even when they harbor abusers. Support in this case means facing the hard truth as to why you/your husband didn't report your son to the relevant authorities? But you have made all this about YOU to where you now imagine yourself as the true victim. 
Your post would even aggregate a nonaggressive individual. I usually read through posts on this support thread and rarely if ever comment but this post of yours is simply absurd and in this case scenario you DO deserve to be cut off.
- Are you kidding me? Ugh!
A place you know you won’t visit now but would have liked to
A light hearted and frivolous look at Royal Ascot


She was the one reason I didn't end my life when this estrangement happened, as I knew she wouldn't want to live without me, so would mean ending her life too, and I couldn't. 15.5yrs together, just her and me for 8yrs. 10days from the start of her getting diarrheoa to passing
I'm so very sorry dear friend to hear about Lilly. In the 6+ years you and I have been posting here on GN's estrangement threads, I've known what a great comfort and source of unconditional love little Lilly has been for you.