I see it more simply. I don't give anybody access to my place. No other family or friends have a key. If I wake to a bump in the night, the first thing I would do is look to my right and confirm that the gf is there. If she is, then whoever is making the noise is uninvited. If she isn't, then obviously my first assumption would be that it was her, and I would make a positive ID before doing anything. You said a family member coming back to bed as if you wouldn't have noticed they're not there. If I go to bed with her and wake up and she's gone, I wouldn't start shooting at whoever I see in the house.. That doesn't make sense. I won't go looking for them, I will hold up in the bedroom and wait for them to leave. If they open the bedroom door I would defend myself. I honestly do not care why an intruder is intruding. Being a drunk asshole isn't an excuse, and if it was a special needs kid, sure that would be awful, but I would put the blame on whoever was supposed to be supervising them... I'm not saying I'm some stone cold badass killer. I'm simply saying if somebody breaks into my place, I will defend myself without hesitation. I don't WANT to kill anybody, but if I feel like my life is in jeopardy, I would do whatever is necessary to protect myself.