Just wanting to give this thread a better bump.
There's not much TV watching in our house (yeah one of those), so I've got a four-year-old who hasn't seen much in the way of movies in general, and in particular hasn't seen Star Wars. External influences aren't a big concern yet...in our town, he's more likely to come home with dreadlocks and a bongo than a Jar Jar backpack (and frankly I'd prefer it).
Thanks to Harmy, I can now start him out right, probably around age 5. And in spite of the availability of the GOUT and Laserdisc transfers, I've gone quite a long time without seeing them at all myself and will enjoy coming back to them (sadly, George's embargo against Star Wars has kinda worked for me, haven't seen it in a decade, maybe more).
Anyway, here's how I plan on handling the SE's and PT: if asked about the "larger Star Wars world", or specifically about characters on Star Wars lunchboxes that aren't in the movies, I will say that in addition to the three Star Wars movies, there is a huge amount of novels, comic books, fan fiction, cartoons, fan-made movies, and even fan-made edits or the original movies--most of which isn't very good, but if he's interested I'd be willing to pick up a novel or comic book for him and he can see for himself. As far as I'm concerned the PT's are on equal footing with fan-made movies (the fan in this case being named George), and the SE's are just another fan edit, and if my kid wants to peruse the world of Star Wars fan fiction, he's welcome to it, but George's fan fiction isn't getting priority placement in the pile just because of who he is.