If you want a full guide I recommend Hanni´s 100% walkthrough at: https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=1271735296
This is just a little help for those who want to solve the puzzle themselves.

If you solve the Ceasar cipher, you can chat with Noel (who is much nicer than Nick), and he will give you a hint on how to get out! He suggests that you look for something that doesnt fit in, and this will be the password you need to get into your server and get out of the house.

The first piece of the puzzle you find right after exiting the bedroom, in the hallway closet. The puzzle piece is _out.

The second puzzle piece is found in the kitchen cupboard, where it says ve .

Third piece is in the laundry bin in the bathroom, spelling out rum .

Fourth and final piece everyone will most likely have seen when they get to the children´s room, where it says put on the wall.

There you have all the pieces, now it is just trying and failing to find the password, but if you cannot wait it is: verum_output .

The password will, as Noel suggested, unlock the server (called Mother) on your computer.

Good luck with the rest of the game, and remember to consult Hanni´s guide if you need more help.