I hired a butler quite a few Sims weeks back. My family consisted of two adults, a teenage boy and a female child about ready to age up. We made him his own room with an expensive bed along with a sitting room and his personal TV but he never once showed up. My family chatted with him on the phone numerous times and they all became good friends, but I have yet to 'see' him. He even takes his pay every week - definitely not a good employee.
The children grew up and the boy married and left the family. The daughter married but decided to live at home with her parents. After another few Sim weeks, the daughter had a baby and the crazy old butler finally showed up
. Good thing his room was still there.
I have a feeling that the butlers will only serve families with babies and toddlers. He has been living with the family now for one Sim week. Very strange
.