Back to school for mom, but kids don’t start back til September-

Looking for care for my 4 children ages 8-12 in my mother’s home on Fridays from 8:30-4:30. Duties include preparing lunch, potentially supervising children in pool, and making sure they don’t kill each other. Kids are fairly self sufficient, and as a result don’t need much- just someone there in case. ideally candidate will know how to swim, CPR, and basic first aid. Good job for a high schooler.