What do you think is fair for this babysitting job?

I am asked to sit for a family who I used to regularly sit for. The family has three children, ages 11, 9, & 5 (kind of a handfull, dont really follow instructions, have to be firm.) They also have a nice large dog who would need to be fed and walked.

The parents are going away for a week and would need me to stay at their house M, T, W, T, F, & S and then they return on Sunday morning. They family usually pays $12.00 per hour.

I believe that I will have to take the children to school sometimes and other times carpool other children to school as well on some days.

On friday the kids will be at a family members house, so i will stay home with the dog.

they family only keep kosher in the house, and i dont eat kosher, and am not allowed to bring ANYTHING into the house as far as food goes.

on saturday, one kid will stay the night at another persons house, and two of the other kids will have friends over to stay the night. how much is fair for those days??