Afternoon Nanny For 2 Middle Schoolers

We are looking for a caregiver for our 6th grade daughter and 8th grade son on the Upper West Side. Key responsibilities include meeting them at the bus stop, taking them to afterschool activities and being home for them if they need anything while they are doing homework. We are also hoping for someone who can do their laundry and straighten up their rooms. In addition there would be occasional grocery shopping, and errand running for the kids. They are great kids who are pretty self sufficient as middle schoolers but because both my husband and I work full time we want someone who can be there for them in the afternoon school hours.