Re: Random sims entering house and not leaving

This is, indeed, super annoying.

If you have MC Command Center, you can use MC Cheats -> Make Sim Leave to get rid of them.

Before I used MCCC, I used to invite the rando to travel with me, take them to the park, and then return home without them.  I used to call this "the middle-school solution," and I used to have to do it with Father Winter every year the day after Winterfest.