I recently created a household of 4 Sims and a cat. It's three sisters - Cate, Carlie and Cassidy Hillingsbrook and Cassidy's boyfriend. Cassidy is a singer and at one of her gigs I noticed a Sim who looked just like Cate. When I hovered over her it said Cate Hillingsbrook, Mixoligist.
Doppelganger Cate got in her car and I followed her to a place where she and Doppelganger Carlie - also a mixoligist - were bar tending. I could only follow one of them home and I followed Cate to the park, when I teleported my real Cate there the other one walked up to the swings and disappeared.
They look exactly the same, same face, hair, clothes, and even make-up.
I was just wondering if anyone else had experienced this and if they had their real sim interact with the other one, were they related or just acquaintances? Thanks.