I mean, absolutely none. I'm thinking of the Las Vegas scene in GF 1. Couldn't Michael, Tom, the Don, or someone have informed Fredo that his father was "semi-retired" and that Michael was now in charge? It looked to me like he didn't have a clue about this until Tom told him in the middle of the meeting. Seems like a pretty vital piece of information to keep from anyone in the family, even poor hapless Fredo!