We have two kids - a daughter who is 6 and a son who is 9. They are both in a combination of afterschool at their school and activities outside of school.
The sitter would be picking up our daughter (6 y.o.) from school in boerum hill and taking her to soccer in sunset park via the subway, waiting while she's at soccer, and bringing her back home via subway to carroll gardens.
In the spring (march) this will change to be located at the parade ground in prospect park and Wednesdays may also be occasionally needed.