My sister is having upstairs and the house is collapsing ?!?

My sister just came home from the bars with some guy she met. They were making out on the couch earlier and moved upstairs to the bedroom after a while. They started making some noise, at first I thought it was a loud game of hopscotch, but it sounds like they were having ! They have been getting louder and louder, like a speeding train, and are quaking and shaking the house, its falling down! Our house is fragile because Hurricane Katrina hit it and our parents haven't fixed it yet (they work 80 hours a week each). The kitchen is collapsing as I am typing and pieces of the office ceiling (the office is right under the bedroom) are falling down on me. My sister threatened to beat me with whips and chains if I interrupted her fun but I am afraid of losing our house! I am worried this rough might be killing her; she is only 12 years old and too young to die! She is also pregnant and the shaking might harm the baby. Should I risk a beating and ask that they quiet down?