I’m confused. What should I do?

Not long ago, my sister and I reported my father to the police for using psychological and physical violence against us. he was threatening to kill us and we got scared. He always beat my mother to death. now my mother wants us to withdraw our complaint. My sister is convinced. And my mom blames me just because the idea came from me. why did you do this? Now no one will want to marry your sister because of you. I don't know what to do, why are people like this? Why would you want someone who hurt you to get out of jail?
Short note: The Menendez brothers were violence and sexually abused by their fathers. Even though their mothers knew this, she did nothing and they got scared because their parents threatened to kill them. and the brothers killed their parents. People always asked them why didn't you run away from home, why didn't you go to the police?
We did what they said, but the result did not change.
I’m confused. What should I do?
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