Is he listed on the birth certificate or has paternity been established? If so google legal aid and get a custody order with your name on it pronto. You do not necessarily need a lawyer for family court. While this is not a service that CPS provides, they should be able to tell you what paperwork you need to submit to have custody established.

I do not mean to frighten you, but this is about priorities. There is nothing to stop this boy's father from picking him up from school and gaining physical custody of him. You would have no choice but to get an attorney in that situation.