Re: Random townies decide to live in my house?

@theFrostySlime You could try a couple more things.

• First you will need to make sure they are all out of the house so you don't lock them in.
• Update your game to the latest version.
• Untick the 'Fill Empty Homes' setting in "Options Menu > Game Options > Gameplay" in the game save.
  Move your household out. If the other family is still there, evict them. Exit the game and save, then come back and move back in.
  Then immediately:
• Add the 'Private Dwelling' lot trait:
  
• Make sure your front door is designated:
  
• Lock ALL doors & gates to "Everyone But Household Members":
  
• Now on the front door select from the 'No Trespassing...' list/menu choose to disallow anyone you wish: