User blog comment:Kabutsu/Assassin's Creed IV Setting Ideas/@comment-4207028-20121125025801/@comment-4207028-20121125193828

It would only be a trilogy in the sense that it has similar settings and time period. Not in the sense that it has the same protagonists (like I said, the second game is where you play as the son or daughter of the character of the first game, and the third game you play as someone with no ties to the first two characters).