We are a family of 4, with two active boys (ages 7 and 10) seeking a nanny 3:20-5:20, Monday to Friday..
Sometimes the boys have separate after-school activities, so it may involve picking up one boy at 3:20, and one at 4 or 4:30. Most of the time the nanny part would involve watching the boys at our house. They often like to range around the neighborhood a bit (particularly the 10 year old), as there are a few kids in the area that they like to hang out with. My wife and I would normally get home by 5:30. Light housekeeping (keeping kitchen clean etc) while the boys are home would be great, but is secondary to helping with the kids. They are both typical active boys.
I should note that we also have a small lap dog (13 years old), that loves people.