A.C.
If you have a problem with them leaving their stuff around I saw once where this lady sold everyones stuff on e-bay that they wouldn't pick up. Also with the fighting tell them that if they don't start working together and helping out that they need to pay rent. I know that sounds wired, but tell them that them helping out around the house is their way of paying rent, so if they don't then they don't get anything stip their rooms and let them only eat the meal that are prepared no snakes or whatever. I know it sounds kind of harsh but they are teens and Need to start getting ready to go out on their own it will happen sooner then you think!