Before School or After School Work

I am a dad who needs help with my 2 kids every other week after school. I need someone who can pick them up from school and bring them home and watch them for a few hours until I get home from work. I may also need some longer hours on days when there is no school, but that is flexible and can be negotiated as instances arise. The kids are very sweet and self sufficient. They may just need help with a snack and someone who can care for them for a few hours.