Babysitter Needed for my Children - Full-time / Part-time

I am looking for an overnight babysitter for 3 children in Fontana. Non-smoker & must be comfortable with a very cuddly cat. 1 weeknight/week 6 p.m. until 8 a.m. the next morning. That night is flexible, but is scheduled 3 weeks in advance. 12 & 15-year-old are self sufficient. 7-year-old will need help getting ready for bed on time and then getting ready for school in the morning. Light housekeeping appreciated, but not mandatory. I'm looking for a flat rate. Kids are sleeping 8 hours. There is a guest room to sleep in.