I agree, Buffy. It's really shocking that they would viciously assault you like that. I'm sorry you are in a family where that kind of behavior goes on. @divine1966 is often a source of sound practical advice. She's right about this matter too. Document with photos, and it's not too late to include them in a police report.

The police would rather intervene now than after something worse happens. In some communities there are officers specially trained for such interventions. They come out very calmly and can be very supportive.

Take care of yourself and know that you are worthy of respect. Nothing justifies the attack you experienced.