If all the Robins were still in school…

Alfred: Master Damian’s grades are up a little this term, but Master Dick’s are way down.

Bruce: Hn. I always have a responsible son and an irresponsible one. Why can’t both my sons be responsible?

Alfred: You have four sons, Master Bruce.

Bruce: Alfred, Ace and Titus don’t count as my sons.

Alfred: No, Master Jason and Master Tim!

Batman, you have a gazillion kids.