My sim was best friends with Ash then went to a club meeting at her parent's house and Ash randomly showed up. While there I could not send Ash home. Then I got a pop up saying Gemma Charm wanted to be besties so I said ok. Ash then disappeared and Gemma showed up at my sims parents house...
So for those of you experiencing this, were the uninvited sims your sims best friend? I thought maybe it was like those needy roommates from DU that tag along everywhere you go. Would love to know if it's a bug or working as intended. I did have best friends as a kid that were always at my house or going places with my family like they were a part of it lol