Part-time afternoon care of our 9 yr old son, may suit student

We are a family of 5, 6 if you include Ted our 2 yr old Cockapoo! We both work full time, our eldest kids are in secondary school and our youngest in primary school. We are non-smokers, like the outdoors and sports but like a bit of TV too! We are looking for a college student in the Killiney area 3 afternoons a week (Tues, Wed, Thurs preferable but open to 2 afternoons either) to collect our youngest son (9 yrs old, in 3rd class) from school, walk him home, help him with homework, engage him in some outdoor activity (weather permitting) and prepare dinner. Hours will typically be 2-6pm but might be a 3pm start on some days due to afterschool activities. No car or drivers license required as we live in walking distance to school.