The Star Wars OT is about the Skywalker clan. That's it. That's who we focused on, that's who we followed. Lucas himself established this pattern with A New Hope which starts off with Vader and Leia, then we go to Luke, then back to Leia, then Luke again, some stuff with Vader and back to Leia and so it goes. Thats it. We see the same pattern in The Empire Strikes Back and Return of the Jedi. All the major points of all the films deal with a Skywalker. So the PT dealing with Luke traveling back into time to see his father fits into that pattern so it should work as long as its not too hokey.