I saw Get OutGet Out for the second time and have one big lingering question - when Chris sees the opened door in the bedroom to the small "attic" space and decided to see what's inside, why would such damning evidence of Rose's previous boyfriends be laid out so obviously and right there for him to find?
Also why was the door open and not locked well, if the box of old photos was in there for anyone to see? If I recall, the sorry had been open and closed throughout the weekend...
Later, we do see that Rose frames the pictures, but if her parents took them down for the weekend when Chris was visiting, you'd think they would hide them better.
Currently, my thoughts (albeit with no evidence hinted at in the movie) are that Georgina or Walter opened it for him to see (after somehow "breaking through" the Grandma and Grandpa's control).
It seems that typically, the family just hypnotizes the guys into a trance and then put them in the basement, so I don't think it was done so Chris would realize what's going on before he's taken down there.