[Ellie wanted her brothers to each have one thing they wanted, and her anon supplies, as best he can.
Ford is easy-ish. A billion dollars, put up in Gotham National Bank, clean money, with the appropriate paperwork all in place, all under the boy's name. With that much money, whenever he wants to go in and withdraw or anything else, he'll be given the royal treatment, ingratiating bankers, tea, a private room, anything he asks for. And it's all his to do with as he pleases, invest it all or gamble it away down to the last penny.
Russ asked for two things, and in the end, he could only have one. Whatever wishes to come or already granted regarding the man's son, Nathan, are nullified, cancelled out completely, a sort of magical "buffer" protecting the kid from any of the horrible plot twists the hotel likes so much.
Whenever it's all done, Ellie might feel a sense of completion, but that's all.]