When Sarah is hiding under the table downstairs and the killer leaves the room, she sees something which scares enough to scream and run back upstairs. What was it that she saw?
Is that what happened? I thought right after she thought the killer left, hands grabbed her legs from behind and she ran upstairs after kicking them away.
Ah. Rewatching, I do see that now.
With the way that Sarah's father and uncle reacted to the Polaroids found scattered in the rooms, they were likely the pictures of Sarah being sexually abused as a child and yet they just shove them in their pockets, mumbling that they're nothing important. Is it really such a casual thing to have accidentally left such photos lying around? Wouldn't that immediately tip them off that Sarah remembers what they've done?
The father thought his brother had left them out, presumably after searching them out in their old hiding spot. Later when Peter finds them he probably figures whoever attacked John left them out, or John dropped them while being attacked.