Nanny Needed For My Children - Full-time / Part-time

We live in Media and are looking for a babysitter who has flexibility for a few hours on M/TH/F, on an as-needed/occasional basis, primarily for our 1-year-old son. Hours would be anytime in the morning/afternoon and would be for a couple hours at a time (e. g., for me to go on an errand/to an appointment). It could be anywhere up to 10 hours/week, sometimes weeks with 0, a week more rarely with over 10. On more infrequent occasions, our 4-year-old daughter might also be present if home from preschool. We also have a 5-year-old dog who is friendly and mainly wants to chase squirrels around in the backyard at lightning speed!