Food, rent, utilities, transportation. Get those caught up first. Maybe you could sell the cars, get rid of the payments and buy two garage sale cars. I would (and do) require my teenage boys to work and pay their own cell phones, car insurance, gas, clothing, fast food, spending money, etc. Is that why the cell and insurance is going down in July? Will your grocery bill also go down?
So you have stuff you could sell on E-Bay?
Could one or both of you get part-time jobs to increase your income?
Are the driving lessons and the graduation party necessary?
Maybe not much help, just a few thoughts…