First ending (Welcome to the family)
To unlock this ending, head out of the room that you started in, go past the kitchen, and enter the room with the rotting carcasses. Here is where you’ll find the backdoor you need to unlock, along with some bolt cutters. Use the bolt cutters to cut the chain on the cabinet just outside the kitchen, and pick up the VHS tape. Bring the tape back to the starting room and play it.
During the VHS segment, simply follow Pete and Andre as they make their way through the house. Pete will reveal a switch beneath the fireplace that opens up a secret room in the starting area. Once you’re back in the ‘present,’ activate the fireplace switch, head into the room, and pick up the backdoor key. Go back to the room with the carcasses and use the key to open the door. This will trigger the end of the demo.