Part-time help with kids in Wahroonga

Hi, My name is David and I have three sporty kids from years 6 to 12 and need help from someone fun and responsible on Wednesdays and Thursdays from 330 till 630 but with flexibility if possible on other nights and to stay later when things come up. Main duties are supervising the kids with homework and preparing simple healthy dinners until I get home. They are at a local independent school and get home by train, but a car would be very helpful for lifts to and from activities. Additional work on other days available when I’m travelling.