Childcare Needed - Full-time / Part-time

We are a blended family in SF with 3 middle schoolers. We need a fun and motivated sitter to pick the kids up from school, drive to activities, buy groceries for the house, cook evening dinners, do laundry, and help with light housekeeping. Monday, Tuesday, and Fridays have specific hours, but the other days are flexible. We need about 20 hours of help each week.