I am so sorry to hear about the difficult situation that you and your family have been experiencing for many years. It is important to take action to protect yourselves from the abuse and violence that you have suffered.
Here are some answers to your questions:
You can file a complaint on behalf of yourself and your siblings. It is important to report the abuse to the police or other relevant authorities, such as a local women's shelter, so that they can take appropriate action to protect you and your family. You can also consider seeking legal advice from a lawyer who specializes in family law or domestic violence.
While it would be helpful to have your mother's support in reporting the abuse, it is not necessary for her to confirm your claims for you to take action. You can report the abuse on your own and provide any evidence that you have, such as medical records or witness statements, to support your case.
The video that you have can be used as evidence to support your case, but it may not be enough on its own to expose your father's abusive behavior. It would be helpful to gather as much evidence as possible, such as medical records and witness statements, to support your case.
You can seek a restraining order against your father to protect your family from further abuse. You can discuss this with the police or a lawyer to determine the best course of action.
It may be possible to seek compensation from your father for the treatment of your brother, but this would depend on the specific laws in your country or state. You can discuss this with a lawyer who specializes in family law or domestic violence to determine your legal options.
Please remember that seeking help and taking action to protect yourself and your family from abuse is a courageous and important step. There are many resources available to help you and your family, including local women's shelters, hotlines, and legal services