If it’s 11 p.m. on a weekday and you live in the city of Atlanta, you’d better know where your children are. In an effort to keep kids safe over the long, hot summer, Mayor Kasim Reed and other city officials announced Tuesday that they plan to enforce the city’s long ignored curfew law. The curfew law requires children 16 or younger to be at home and supervised by a parent, legal guardian or authorized adult from 11 p.m. to 6 a.m. Sunday through Thursday, and from midnight to 6 a.m. on Fridays and Saturdays. But the big change from previous enforcement threats came in the form of punishment threats — for parents. The first violation will result in a warning, city officials announced.