nightmare about murderer

Date: 7/29/2016

What's weird about this dream is that I vaguely remember parts of it from another dream but this one was different. It was so sad. Basically I was coming home with my dad and uncle, but neither of them looked like my real dad and uncle, and like there was a narrator that said "we thought we were safely coming home after a nice trip, but we were so wrong" and it was like I knew exactly what was going to happen. I ran inside to my room but my house was set up different. When I got there I opened my window then pushed out the screen and jumped out. I left my brother and I can't believe I did that. I know it was just a dream but I feel as if I betrayed him. Then I snuck around the side of the house, which looked like a trailer, and hit near the back out of sight. I heard the "nice" stranger talking about his wife. Even though I didn't see it I know that what happened was that he was talking to my parents and then when he brought up his wife he had cut off her head and he showed my parents her head. They started screaming and I ran for it. Somehow my dad had gotten out and caught up to me. When he did we jumped on a horse and rode away. The man was quick and eventually we ran into an insane asylum. While there he tried to set off a bomb that would make me explode but the room we were in had a thing set that disabled the switch. He was taken away and I went home. What's weird is that while I was home (I actually went to a different house) everyone was alive but I know he had killed them. I eventually ended up at a different house which is actually my current apartment and I was so scared but I wasn't alone. My dad, sister, and other sister were there. My dad was so angry about what the guy had done and I hated myself for not saving my brother. Then suddenly when I was in my living room I heard the same man from before talking to my neighbors. I called the cops then in the middle of that the murdered had stopped talking and there was no noise from the apartment. I tried to get Zoe (my sister) to close every window, and eventually she did but it took a lot of convincing. I haven't had a nightmare that made me so upset after and I honestly wish I don't dream about this again soon. Btw this was the second part of my dream but I don't remember the first, all I know is that is wasn't scary.