Yeah of course, that's the whole point - to find apples of eden for templars and assassins trying to find it before the templars do, seeing as Altair had access to the Apple and it seems like the sort of genetic thing that allows their whole bloodline to have it ( I am trying not to drop any spoilers for you as I don't know how far you are in the story).
Because Altair had access to the Apple it's likely that Ezio and maybe a third - not even confirmed if exists yet member of the family had access to more potent objects than just the apple, but I think there are several of those apples as well - and the Grand Temple too - which is what the Templars are looking for.
I finished revelations - the ending was so-so but it made the game kinda more clearer in regards as to why the hell they're spending so much f'ing time in the animus for the ezio part - 3 games is a long time after all.
It's harder to have a discussion with someone who is yet to finish Brotherhood and Revelations as I don't know how much you are aware of ;_;
Disconnect and self destruct, one bullet a time.