Afternoon childcare needed, 1-3 afternoons per week

Needed: afternoon childcare for two kids ages 10 and 12.
Help needed 1-3 afternoons per week, from ~3-6 pm.
$20/hour.
15 minutes from campus
Must have car and clean driving record.
Involves picking up from school and bringing to our house in Menlo Park, providing afternoon snack, helping with homework, and driving to afternoon activities in the area.