Well, you'd be the first to notice. I dissapeared for 36 hours once, and my family never asked where I was. (Just wandered off and ended up at a friend's house.) Only happened once, but I question them, as I was 14.
family is just something that you get with your birth, it doesn't mean that they deserve you at all or that they have to be first on your life priorities list.
Why spend 25 years in prison when you can learn to play guitar during three of those?
And you can disembowel all the goblins/christians/trolls/etc you want without fear or reprisal.