Ok so post-Red hood and Batman fuid. Bruce and Jason have a good relationship ( do not make this weird) and Jason know only kills on rare acashions and Bruce is like "I'll take it". Because he lossed his kid and Jason sometimes calls him "Dad" Then one day Jason corners a thug or like a roage (maybe the Joker) and it goes something like this:
Red Hood: Where is -----?!
Thug: I-I don't know!
Red Hood:Well find out or this bullet is going in your head
(Batman passing over head)
Thug:Batman help!
Batman: Hn (hello Hood)
Red Hood:Hey dad
Thug:DAD!?!
(No one belevies him till others find out then it is a whole new thing)
(On an unrelated note I love the idea that Bruce calls Jason sweetheart)