I have to babysit some brats need help?

I'm 14 and my mom's friend has these 2 freakin brats that she wants me to babysit! I meant they're like high on something. They want 4 tubs of icecream when her mom goes to the store, her mom says no they pull out all the icecream and throw it on to the floor.. Great just what III need. And at home they eat everything in the fridge and don't even ask. By the way they're twin boy and girl 6 year olds. i have to babysit them saturday for 3 freaking hours im pissed how do i get out of it???