Why did I have a dream of your friend stabbing my mom in her kitchen in her stomach killing her then turning around and killing me in my house hallway Weird teleport by slitting my throat?

In this dream, the "friend" probably represents part of the dreamer's self that is very angry. The dream seems to express the fear that if the dreamer loses control of this anger, or allows hidden feelings to surface, disaster will result that will hurt both the dreamer and the dreamer's family. It is helpful to understand that dreams typically exaggerate and over-dramatize things, so that ordinary anger appears in a dream as murder.