I change the butler's traits to neat, foodie and family oriented. I also change the way they look. Now, the butler in Wayne Manor took great care of the baby like clockwork. They seem to cook meals in all the households I have them in. They are glitchy in that when my sim comes back from another lot I may end up with a butler from the other household for a day or so before they switch back to the one I hired for the lot. Just like @LeGardePourpre said, I let them do their job. I think they do better with the right traits though.