ISO occasional babysitter (weekdays) for 2 children in Highland Park

Hello, We have two girls (5.5 and 3yo) who will be in school this Fall. We are looking for occasional weekday/daylight care in our home (900 block N St Clair or open to your home as well) in the event that our nanny is ill or one/both of the children are sick and cannot go to school. We have no pets and do not smoke. Thanks! Sheila