Originally posted by Don Cardi:
In all seriousness let's look at Anthony's life. A young boy whose house is shot up. A party with soooo many people that he did not know. A father who goes out of town on business quite often. A fishing trip with his uncle where he is called away from at the very last minute. His uncle goes and supposedly dies in an accident. Neri lives. I imagine him going to school hearing the murmers about his Mafia father and his family. I'm sure tht there was gossip around the house about Fredo's act of betrayal and then his "accident." The boy witnessed his father's coldness towards uncle Freddie. Saw his father's power in having his mother banished from his home. Put all of these things together and I think that eventually anyone growing up that way, in that envirement, would evetually summize that their uncle was probably killed.
Don Cardi 
That's right. However, given the fact that Michael's activities were widely known (remember Connie's line: "Read the papers!" in GFI or the Senate hearings in GFII), I think that it was easy for everyone to figure out what happened, not just Tony. But figuring out and knowing for sure are two different things.
