Dream About Sister Boyfriend Fighting

My sister and her boyfriend (who I don’t get along with) were staying in my dads finished basement for a bit. I came over to visit my dad and he told me I should go down stairs to see my sister. After my dad went up to his room, I made my way downstairs but heard whispered fighting so I crept down slowly and quietly. When I got to the door it sounded like muffled crying and heavier fighting. I opened the door quickly and saw my sister pinned against the wall by her boyfriend and she was crying. He was pinning her by her throat and was mad at her for whatever reason. I didn’t think and I walked over and punched him and dragged him down by his hair. I started punching and kicking him while he was on the ground telling him he’s a piece of shit for putting his hands on her. Then my dad and step mom ran down and dragged me off of him and told me to stop. I was screaming at them to call the police and they kept telling me “No she’s happy with him” and dragging me away further. I kept trying to tell them how he had his hands on her and she was crying but my sister kept denying it and my family told me to stop and just leave them alone.