Puternut:
I can understand the pain you are feeling. Just because they walk away, doesn't mean they aren't feeling turmoil themselves. You are their father. The anger comes from things not being the way they were and the confusion they feel right now. They are conflicted and the anger is defensive.
I know this is a lot to take in. Yes, I know you are on the outside looking in. But, do not give up all hope of being a family again. It will take time for them to sort through this. You have a cult messing with their minds and free thinking. Right now, they are being fed that you are the enemy. Being forced to choose sides.
Fight for them, even if it is just visitation rights, going to counseling (even if it is court mandated), each opportunity to open that chink in the mindset chain do so. Your children are smart don't think they aren't thinking on this. Just keep the lines of communication open. Let them know your love is unconditional. Because once they come out of this conditioned love they are going to need it. It will show the difference between what they are used to and what they should have. You may not be able to change the past, but you have control over the future and what you do. Keep writing, calling, and letting them know just how important they are to you. If you don't think it will change anything, you are so wrong. Just ask Maybesbabies, just how important it is to keep that door open and have that unconditional love. With out it, we would not have reconnected as sisters.
X.