I am just starting out, so I have never had this issue as of yet, however, I did just interview a couple who have a child who is starting school in september and a younger sibling. They are trying to get into after school care through the school and if that didnt work out, they said they would find someone near the school who did afterschool care, and keep the younger one with me. I'm sure that it is not too uncommon for that. I dont drive the kids and the only way I'm doing school runs is when my own daughter goes off to school next september.