knittingnancy
That's incredibly sad. I'm sorry.
I would suggest that the best thing for you to do is to wait. You might consider putting birthday and Christmas cards into a special box to save for when the children are older, rather than sending them, if you think they won't be well-received.
Meanwhile, I would suggest that you consider some counselling and finding something to occupy your time. I understand that you're upset, but just sitting and obsessing about the situation is not healthy. Counselling and a hobby may help to take your mind off the situation, at least temporarily.
If you try to force a relationship with your daughter and/or your grandchildren, my concern is that you may lose her permanently. If you step back and give her time, she may decide to re-initiate the relationship.
Welsh Senedd Election - PR in action. This will be interesting!

. I asked the OP if she knows what her other D and her son think of the rift.
oh yes; absolutely.