Part time nanny on Wednesdays

I am looking for someone to look after my kids on Wednesday’s from 3-6pm during school term and occasional Monday afternoons from 3-7pm. They are 14 (son) and 11 (daughter). Both need to be picked up from school (two schools, same suburb) between 3-3:30pm and taken to extra-curricular activities. Their schedule varies between terms. Some easy dinner prep and lunch box making would be part of the afternoon routine.