We are all united in your support, in this sad but not uncommon story OP, and you can post as much as you like.
It can really help to put order to your thoughts as you ponder each word as you write.
I believe whatever you do, your daughter will create her own narrative, with or without LB.
Her sisters have taken a back step yet still she enquires about cards for her children, choosing to remain conveniently obtuse and oblivious to the pain she has caused them.
I really respect their conviction in their position.
IMO, if you honour her request and cease all contact, as time goes on, I believe she will be irked and will go back to that final email she sent.
In time, despite her fury and resentment of you, SHE may realise that all you are doing is following HER unambiguous instruction.
LB will not like uncertainty regarding her inheritance, and despite my distaste for mentioning this, sadly I do believe it will inform their behaviour over the coming years.
In your place I would consider diverting the monies to your grandchildren to receive on their 30th birthdays.
Taking the time to discuss with your DD2&3, your desire to provide a nominal amount to be held in trust for your daughter 1, should she come for help from them before your bequest to your grandchildren is actioned.
These monies can revert to her children should she remain with LB.
They have substantial funds, or rather he has control of their money.
I have zero doubt that any monies left directly to your daughter 1, in the next few years would be coercively taken by LB, effectively lost.
Far better IMO for these monies to be kept for your grandchildren upon reaching 30.
Good legal advice is key.
My belief is that LB will try and control his children as they grow.
Providing them with some funding to help improve their lives as adults would be a wonderful gesture.
Perhaps home schooling will work out, but I wonder will LB fund university education in an expensive country like Ireland, lovely and all as it undoubtedly is.
Take your time to tease things out.
Also, in your place, your other two daughters may need your greater financial support into the future, and that is not unreasonable to prioritise too.
Lots for you to think about but try not to be overwhelmed.
Wishing you well.