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To add on this, alternatively, Bruce bringing over a Normal Person Friend™️ for once in his life and the entire family being completely convinced that they're some kind of secret hero and very unsubtly trying to sleuth out which one. They're all 100% sure that Bruce is just fucking with them and are completely detirmed to find out what George the accountant is actually up to. Is he a hero? Maybe an anti-hero that Bruce won't admit he enjoys the company of for his ego's sake? They don't know, but, goddammit, they want to. Bruce insists he's just a friend from a charity gala. BUT IS HE REALLY THOUGH.
I have seen a lot of fics about the Justice League finding out Bruce has kids and being shocked about it, but what about the other way around? Like imagine Dick ghosting Bruce and ignoring everything related to Batman for six months after an argument and the day he finally decides to visit to make amends he finds fuckin Superman chilling on his kitchen, or like Jason coming back from the dead, ready to fuck shit up, just to get whiplash after finding out that his loser dad has friends and one of them is Wonder Woman