Once You've Crossed the Dam, there are 2 house on hills one to the left and and one straight ahead the one on the left contains a puzzle which will net you the
The house ahead is the one we want, follow the path to the right and when the path splits, take the left path up and around to the front of the house.
Once inside there is a photo to look at, once that's done 1-by-1 enter each room and if there are extra rooms off of a room you enter enter them as well.
In most of the rooms you'll get either a comment by your character or a snippet of conversations between Ethan's family.