So we established that Duke CAN see the future (with his bullshit powers that make no sense to me)
So I was thinking let's say when he joins the batfam Bruce opens up an account for him that all the other bat kids have right? Duke being the shy new sibling that he is ( for now) doesn't really touch the money
BUT as soon as he discovered his future seeing powers and knows that he can see the future he uses the money in his account to do stock trading and shit
Nobody notices at first but when Bruce is going through all of his kids financial records(because let's be honest he will do it)he is DUMFOUNDED to find Duke's account to have slightly less money than him (10 million dollars less than him to be exact)
Bruce doesn't say anything at first and is trying to act normal (like Duke isn't now the second richest person in the world) but then THEY find out
Duke and Bruce are patrolling tonight alone as a father and son bonding experience because crime is slow (thanks to Duke being an eldritch abomination by day) that just leaves a very bored brood of teen aged batlings in the cave
Tim finds Bruce open tap of the bat kids Bank account and decides to make a game to see which of the batkids has the most amount of money
Tim is in the lead so far because he basically runs Wayne tower at this point
Then is Jason because crime boss money and is actually responsible with money
Then Cass because she's Cass she only ever spends her money on food and shopping with Steph
After Cass is Steph because I think by now she's in college and can handle her own money
Then Damien became he needs to ask Bruce to use his card because if he didn't he'd buy multiple zoo's
At the very last place is dick because I believe he would be severely irresponsible with money
But then they get to Duke's account they think his account would be somewhere between Cass and Steph's but no Duke is a billionaire
Jason, Cass and Steph are laughing
Tim is in absolute shock right now
Dick is sobbing on the floor
And Damian? Damian is trying to figure out how it happened
And Alfred always knew because he's Alfred
When Bruce and Duke get back to the cave they notice the others acting weirdly (because they want to see where Duke is going with this) but they pay no mind
As for Duke and his reason for being a billionaire he wants to fund the We Are Robin movement to an actual vigilante group and make people like slightly less miserable