who were the cunningham boys and what happened to them? Whats the irony?

The Cunningham boys were a part of the group Boo hung out with. When the boys got into trouble, the Cunninghams were sent away to industrial school..... they were reformed and got a great education. Mr. Radley refused to let Boo go. Boo was left stuck in the house, while the other boys got engineering degrees, all because his father believed that to let Boo go would be a disgrace.