And there's another thing I've always wondered.

In GF2 when Michael tells Fredo he's nothing to him now, not a brother, not a friend, etc., he also says that he doesn't want to see Fredo at any of the hotels and (I think) casinos. In short, he doesn't want to see him again.

Did this mean that Fredo was banished to New York (from whence he came after escaping Havana)? How did he support himself? When he arrived for Mama's funeral, it just "felt" as though he was a visitor returning from elsewhere, far away. Was that the case? Was Fredo fired from Michael's hotels and casinos, or did he still work in them but Michael arranged it so their paths would never cross? I also thought all the Corleones lived on the "estate"? Where did Fredo live after Michael disowned him?

I just think it would have surely been another humiliation for Fredo if he had to work in Michael's hotels, live on Michael's estate, depend on Michael for his "living allowance" (or whatever payment he receives out of the family funds) while all the while people are whispering behind his back about why he and his brother are so estranged.