I think it has only happened twice for me, but it was quite a while back. I hadn't played either family and I can't even remember who it was that had them, but I thought it was kinda neat. I finally did go in one family and play them and the twins were really cute. The other family, for strange reason, up and moved and I never got to play them. I looked and looked for them and never found them. It does happen, just not very often. I am curious to see if anyone else has had that happen.
If I had not welcomed you to the forum I will do so now, welcome to the forum and hope you enjoy.