I'm so happy to have met you!
After reading your text and the full version of your comment, I can feel that you are somewhat disappointed with this family internally. I can also sense that you feel both pity and "loathing" for your younger sister. You can empathize with her heart-wrenching cries as a child, and you can understand the immense fear and terror she felt at that moment. I can tell you feel very sorry for her.
And now she's rebelling and yelling just like her mother. It can feel really frustrating when we feel powerless to change someone's behavior, especially when we disapprove of their actions. It's natural to feel a sense of heartache and helplessness towards our younger siblings when we feel like we can't change their behavior.
You've done so well in such a challenging family environment! You've learned to draw your own boundaries, protect yourself from their influence, and clearly see the symptoms of each family member. You're doing great! I'm so proud of you. I have a few suggestions for you:
First and foremost, remember to be kind to yourself, love yourself, and nourish yourself. Let go of your expectations of your parents and don't make any unnecessary efforts. You've got this!
Be your own spiritual parent. You've got to love yourself first, so you can give love to others.
Secondly, a mother who behaves in this way is also likely to be feeling anxious, insecure and afraid on the inside. These feelings have been there for a while, so she tends to grab and control people around her. These neural circuits have already been fixed, and as soon as she feels anxious, afraid or insecure, these behaviours will appear spontaneously, without her brain's control. At that moment, she is "unconscious".
It's so hard when we don't know why we do the things we do. It's like there's an inner "pit" that we just can't seem to fill. And as long as that pit is empty, our behavior will keep repeating itself. It's so sad because she's not aware of this, and she hasn't learned from it. So it's really difficult to change her by reasoning with her.
It's okay, you've already done your best. You can't help her fill in the inner emptiness, but you can help her realize how absurd her behavior is and that she can change voluntarily. So what you can do now will not change her. You have already done your best, and your power is weak.
I really think that if you can, you should take them to a counselor or family therapist to help them heal a little. The same goes for your younger sister, who is a "replica" of your mother and who is internally as deficient as her mother. She's just trying to awaken her.
At the end of the day, parents all have their own life lessons to learn. What you can do is just be a good person yourself! It doesn't matter if it's mom and dad or your younger sister, they all have their own paths to follow. Try not to get involved in their lives, and don't feel distressed by seeing them living like this. These experiences are not pleasant, but they can also make them grow in some ways, and they are not completely without benefit.
You can be a good person yourself first, and then use your love to awaken them.
I really hope my answer helps you out, and I wish you all the best!


Comments
I can see how difficult and painful this situation is for you. It sounds like there's a lot of unresolved tension and hurt within the family. I feel for you, and it's important to find a way to express your feelings without escalating the conflict.
It's heartbreaking to hear about the experiences you've had with your sister. The way she was treated as a child seems to have deeply affected her behavior and your relationship. Maybe finding a professional who can help all of you communicate could be beneficial.
Your sister's actions and the way you were treated by your mother are not acceptable, and it's understandable that you're feeling frustrated and even hatred. However, holding onto those feelings can be draining. Have you considered talking to someone outside the family, like a counselor, to process these emotions?
It's clear that you're in a tough spot, torn between compassion and frustration. It might be helpful to set boundaries for yourself to protect your mental health while figuring out how to approach your sister. Sometimes distance can provide clarity on how to move forward.