It's a good to know that my dad refuses to do anything about the fact my little sister keeps reaching for kitchen knives and threatening to use them on me when she's upset with me.
Replace them with the rubber and retractable counterparts, then edge her on to actually stabbing you. Make the death look real and then they throw her into the slammer! too macabre?
Well, if your dad refuses and you feel like you're actually in danger, talk to your mom. How are you currently defending yourself?
... I don't feel I'm in danger, I just hate that he always takes her side. All I did was yell at her really. I just snapped. No one said anything, so if my dad refuses, then I'll handle it my own way.