Villains in Addams Family movies go to really unnecessary lengths to defraud them of the family fortune. These people just give it away on whims all the time. If I just walked into the house and started wearing their clothes and spending their money, they wold start introducing me as Cousin Intruder and forget there was ever a time I didn’t live with them.
There’s a whole plotline in the Addams Family Musical where Morticia and Gomez realize at the same time they each thought Grandmama was the other one’s parent and no one knows who the hell she is, and literally nothing changes because, well, she’s Grandmama now.
Gomez’s life’s ambition is to be a failed investor, just walk up to him and say “I’ve got this crazy idea, it’ll probably never work, but I need 5 million dollars to try” and he’ll just shout “brilliant!” Then sword fight you and give you the money
And because it’s Gomez whatever you do with the money will end up outrageously profitable
i find it impossibly funny that this is the canon reason for the adam family fortune. gomez desperately wants to be a failed investor and lose it all, but every single unhinged thing he throws money at *somehow* ends up becoming wildly successful