Part time nanny for 2 energetic sweet girls

We have 2 sweet girls 4 and 5 years old. We also have one on the way. We need someone to watch the girls for the summer until school starts3 days a week, and then possible transition into watching the baby 3 days a week starting in October. we will expect the sitter to play, interact, participate in activities, prepare meals, clean up after meals, child related task as far as house good duties ( cleaning up dishes after meals, sweeping after meals, girls laundry, etc)