VERDICT: I am desperate to find movies suitable for a 5th grader and lowered my standards.
I Spit on Your Grave 2 is not such a movie. 
Hahahahahahahahaha! Neither is Blood and Black Lace, or The House By the Cemetery, or .... 
Once you get into 7th grade or so, you can always get out some of the tamer Hitchcock movies. Not horror, but require more thought than most horror and suspense. All depends on if the younger person can tolerate, "Old" movies and movies without lots of action. I know of someone, back in 2001 or so, complained about I in he late 90's her mother coaxed her into watching an, "Old movie". That old movie being, "Rosemary's Baby" when it aired on TV. She said she laughed throughout it. She was in her early 20's at the time.
OH, something that just clicked in my mind, a great horror movie, for younger folks, and also older, though I'm not sure if it's a nostalgia thing for me. The last time I watched it was Halloween 2012; "The Willies". It's a horror anthology, like Creepshow, but PG-13. Has some good lessons; Don't be a bully, don't torment animals, etc.
I still have not yet revisited Mrs. Doubtfire since a theatre viewing, and later VHS rental or similar. I'm not sure if I'd like it better, but I may, as some stuff may have been over my head at the time, or I not appreciated so much at the time. Similar to how I appreciated Overboard, Parenthood, and some other stuff from the 80's as I got older.
Anyway, I have not watched anything more, but I did set aside some money for the Blu-ray of UHF, which is released in Novemeber. I haven't seen the movie in 7 years or so.
I did watch some of the Simpsons marathon this weekend, and while not a movie, it might as well have been.
.
