I mean I usually have thralls locked in my sim's basement until they outgrow their use and in which I talk to their family and give them back to spend usually the last 3 days of their life before they die of old age, but as a catch I usually take the youngest in the family and throw them in the dungeon to be raised by the other captives.
It's lil bit evil, but I made the mistake of giving my vampire a major drinking problem (sloppy and gets thirsty faster) and thus he needs more iron. Poor guy
This one is abit more grim;
Another time was when another vampire kept stealing my drinks so I added him and his wife to a separate basement where there was all the food to ask for, prepared to perfection. One slight problem though, there wasn't any food for the vampire to eat and he would get hungry fast so while his wife could gorge herself with tons of different kinds of foods he only had one thing to eat.