Wow. I'm so sorry this happened.

I think anybody who reads this post would agree that your mother is mentally ill. Until she gets help, I would not speak to her if I were you, and I'd certainly keep my kids clear of her. If she tries to contact them, I would seriously consider taking out a restraining order because her behavior towards your daughter is frightening. I'm surprised that if you knew your mother had serious issues, you left your kids there with her after she reacted so insanely after seeing your daughter's hair. There is absolutely no reason why a grandmother should behave this way about anything, much less a haircut.
None of us, would have ever guessed that she would so totally lose it on the grandkids. Her own words - Logan and Delaney are all that I have to look forward to. The sun and moon rise and set on these kids. They are the only grandkids she has.
I'm sorry, I think that if you looked at your mother's behavior clearly over the years you would see that this would have been predictable. You said that you've always had very long hair growing up. That's not just you; families with long hair usually have a mother that's very invested in keeping a daughter's hair long. Were there discussions between you and your mother when you were a child where she would not let you cut your hair? I bet there were.
When she said that the only things she has to look forward to are the kids, that should not have re-assured you, that should have been a red flag. This woman is screaming for help, and it seems like nobody knows how to give it to her or to establish boundaries with her. Everyone, including your dad, is tiptoeing around her.
My dad will get to see the kids as much as he can, outside their house. The only problem is, when she finds out he is seeing them, she will lose it one him and make his live in that house a living hades. About 6 years ago, he came over to our house one Christmas Eve before going to chruch, she found out about it and he hasn't heard the end of it. Every year, when he gets ready to go to Christmas Eve service, she starts in about going to their house to make me look bad in from of T's (DH) family.
He is allowing her to throw temper tantrums and behave in this manner. He is absolutely allowing this behavior. Have you ever heard him once say to your mother "Your behavior is not acceptable to me and I want it to stop right now. If you do not stop, there will be consequences."
I agree she should never have left them in that house.
Yes. This is hard to hear. Sometimes you know something is wrong and you do it anyway and you hope for the best. Everyone screws up with their kids. This is one of those times for you. You screwed up by leaving them there because you can't undo what happened.
Right which puts him in a place that harms your children. Why do I say that?
It is because he is protecting his wife. And he will choose her over his grandkids. That is something you need to keep in the forefront of your mind at all times. Do not let your father have unsupervised visits either.
I absolutely believe this as well. If you think your dad will protect your kids, ask yourself did he protect you adequately from this woman when you were growing up? Your next quote below states that you protected your dad-why do you think he would protect your kids? It is not how he has previously behaved.
I am and will always be daddy's little girl. I fight tooth and nail for my dad. I have lived, since I was a teen, with the attitude of mess with my dad and you don't have to worry about him, it's me you have to look out for. And for as much as I love and would do anything for my dad, his and moms life kills me. He is very much of the old school - for better or worse, in sickness and health, til death do us part. He knows it's not healthy for him to live with what she doles out. And I am willing to bet I don't even know a 10th of what all she does. But to take what little time he does get to spend with the kids, totally away from him, would take anything that is positive in his personnel life away. Even just typing that makes me start to cry. To cut him off from the kids, it would kill my dad, then she wins. He would tell you that he can take whatever she wants to dish out at him.
If you are Daddy's Little Girl, he should be fighting tooth and nail to protect
you, not vice versa.
Why does your dad make you protect him?
Does he say that your mother makes him unhappy?
Does he say that he wants things to change?
I don't think he does, because he likes things the way they are now. His statement "I can take whatever she dishes out" says to me he does not want things to change, or is unwilling to make those changes, even when it CLEARLY hurts your family.
He can see your kids any time he wants without her, he just gets in the car and comes over. You're not cutting him off from the kids, you are establishing boundaries where you protect your own children.
Both of your parents either respect that, or your mother will throw more temper tantrums to get attention and your dad will play the martyr card.
I cannot reiterate enough that these women who behave like this continue this behavior because it is SUCCESSFUL until somebody reaches their breaking point and cuts them off completely. That in itself creates a whole new drama for the person-oh, woe is me, my family hates me, yadda yadda yadda, nobody will talk to me. They will continue to feed off that.
Instead, change it up. Have the difficult discussions with her. No more tiptoeing. No more letting the dad off the hook for behaviors he fully supports and participates in. He's not a victim; if he's not putting a stop to it, then he's part of it.
I can tell you, if you begin to change the family dynamic this way, things WILL get uglier before they get better. You'll either discover that your mother is truly mentally ill to the point where she requires care, or that most of what is occurring is behavioral and can be changed. Hope for the latter.
Let me emphasize that I am not trying to tear you down; sometimes the answers are hard to hear and harsh. Life and relationships can be really ugly sometimes, especially when we deny behaviors that are right before our eyes. This is how I see your family based upon what you have presented here, and this is my advice for how to begin to find a solution. Take it or not, as you wish, but know that the spirit it was given was to try and make your world, and your children's world, a more peaceful one.