I've had many roosters around my kids since they were young. It can be done, but you have to be watchful. If a kid picks up a hen and the hen squawks, any good rooster will attack to save her. Teach the kids how to handle chickens gently, and only keep roos that respect you. I run a summer camp with lots of chickens in our farm program. We have kids aged 5-19 in our programs and have yet to have one attacked by a rooster. Wish I could send you a couple. 
