Sarah Palin's Family Fight -- But Occifer, They Started It ... Says Bombed Bristol

Sarah Palin's kids ain't afraid to throw down with anyone ... which they proved during a drunken house party brawl. Now we've got audio of Bristol Palin giving cops the blow-by-blow of the whole fight.

Extreme violence, thongs, even camouflage dresses -- yep ...definitely the MOST EPIC FIGHT ever!