I am sorry they are doing this to you. It hurts.
My self personally, I wouldn't bother with the woman or any of them. They don't deserve you or your children. You are all better than that. I wouldn't write, text or call. Why should you? She and other family members don't respect you. Respect is earned.
Trust me it is their loss. I have had to do the same thing with family. Sad!
What a loving bunch of hypocrites eh?