Need help i think my dad Hank Hill is trying to kill me, what should i do?

This is a big problem. At first, hed only threaten to to slap my nut sack if i talked back to him, even though i had never said anything in the first place, but now he says that if i tell anyone what he said, he would be forced to set me on fire with propane, and propane accessores! Im scared, and i think he really will try to hurt me. I always see him yelling at my mom peggy, who he calls piggy, and he hits her really hard with a propane tank. The sounds of fists flying at 10,000 mph against her face can be heard for hours a day. I tried calling the child services people, but i saw the guy walk in, and he never came back out and now my dad says if i saw anything, he would shove sausage forks up my ***. please sombody help me.