If the cops show up and ask questions, absolutely do not answer any questions. Instead ask, 'Am I being charged with something?' If they respond with anything other than a yes or no, simply repeat the question, but don't be a smartass or dick about it. When they answer the question, if it's a yes (you are being charged), ask what you're being charged with, then ask for a lawyer. If they answer no, tell 'em, well then, you're going to be on your way and have a nice evening, officer.

Don't let them search anything, don't let them in the house, don't answer any questions except for your name, and provide them ID if they ask for it. Also, if anyone has a camera of some kind that records video, get them recording what's going on, so the cops can't just make up stuff after the fact.