Physical and sexual abuse in the family

This could be long so bear with me.

My aunt is 26, her husband is 25, my sister is 15, my cousin is 5, I am 19.

My aunt was sexually abused by her father for many years as a child.

Her and her husband are split but live together because it's easier for everyone.

In November they got full custody of my sister who they have been battling my drug addict mom for two years now (my mom has only had my sister for 4yrs)

My sister was sexually abused by her dad when she was younger. She was physically abused by our mom.

I was sexually abused by my dad.

My uncle was sexually abused by his brother and mom as a child (his brother was abused by his mom)

**Note we all live together (me, sister,cousin,aunt,uncle)

So obviously we know we have a family curse to break. We thought we were doing everything right, we empowered the 5yr old. Teaching her to yell stop touching my body and to never keep secrets. We don't leave her alone with people we don't fully trust. (Basically school or home with one of us)

We learned today you can't trust anyone..

My cousin told her mom today that her "sister" has been putting a pillow over her face and holding it until it hurts bad. The 15yr old broke down about having "impulses" to hurt the 5yr old and about hurting her "like her dad did her". The little one won't talk about it anymore just says she doesn't want to. My sister was already in therapy and will have an emergency meeting tomorrow as well as be evaluated for placement at a facility. We will also be seeking help for the 5yr old

.... None of us know how to handle it. We don't want the older one to think we hate her , but also want to protect the little one. We are all aware hurt people hurt people but have been blindsided by this. I have helped raise the little one and I love my sister dearly..I feel like my heart has been ripped out. I have no one to talk to about it so I'm reaching out to you all. Please pray for our family and send us healing vibes.