I have a saved game that has the same butler in multiple house issue I'd like to share with you. The Google Drive link is: h t t p s://drive.google.com/file/d/0BzPNWx3L-nC1dUFyNXhLbnJzcmM/view?usp=sharing (sorry I am not here long enough to post links so cannot do hyperlink).
There are 4 Played households, 2 in Willow Creek and 2 in Oasis Spring. 3 of them have the same butler.
Please note that often when my character leaves the lot, the game would change the butler to a different one upon coming back (the non-Goth family in Willow Creek ended up with the same butler problem because of that). So if you are not seeing the same butler upon first check, please rotate the families.
So essentially, there are two problems here:
1. The same butler in multiple families
2. Family butler gets exchanged upon leaving the lot
Hope this helps. It's a really annoying issue and really affects the joy of an otherwise amazing game. Thanks!