nightmare

Last night's dream: I can't remember what happened at the beginning of the dream but I have a vague recollection of doing something wrong, I think it was cheating on my partner. As always I have just murdered someone, I don't ever see the actual murder but the body (very graphically injured, head cracked open, brains exposed, lots of blood) is at my feet. We're in the persons house but really it's my house. I'm supposed to know know this person but I don't recognise them or know their name, but it's a young male, around 13/14. I hear noises downstairs so I quickly leave the room, shut the door so no one can see and end up talking to the lads mum. My sister is there too and she goes upstairs while we are talking and then the mum asks where her son is, I say I don't know so she goes to his room. His body is gone, his mum reports him missing. I notice my sister skulking around and go over to her, she says don't worry, I got rid of him. She gives me an alibi for the police. His body is discovered not far away but I'm not a suspect to the police. I get the feeling the mum knows it was me though. I get away with it as always.