Right... if he's ok with LotR, he'll probably be ok. There are, however, werewolves, dog attacks, talk about murder, and Dementors - nasty things that look like Nazgul and are really quite scary - in HP3, so if any of that might bother him...
Also don't go opening weekend, there will be fangirls everywhere squealing madly.
LOL, too true.
the dementors *might* get to him.... we will have to see. He wasn't really phased at all by the nazgul. He was more curious than anything.
godmother (funny story 'bout that too) took him to see shrek2 when it came out. now, after having seen it once, he is quoting it all the time.