Babysitter - Full-time / Part-time

We need childcare for our three children. We have a 21-month-old and 4 mo old twins. We need coverage on Fridays. The Fridays we need covered will be different every month but we will give a 2 month ahead schedule. We are open to discussing changing care to every Friday. One parent will be home until either 1:30 or 3:30 depending on work schedule