We have a winner!
I created a Sim with the "dislikes children", "loner", "neat", "neurotic" and something else I can't remember...........then I gave him FOUR evil and grumpy toddlers as children and put them in a one bedroom shack. Thought it would last a day.
What a champ! He was miserable and when I let him out of the house at night to go to the park alone, he would just sit on the swings and cry. BUT! He never neglected a child. He would take an awful lot of baths to get alone even when he wasn't dirty. He earned stacks of happiness points just by cleaning things and bathing.
He has so far lasted 8 weeks and two days with NO threats from the social police.............. You should have seen him! He would half way prepare a horrible meal when he was nearly starving, stop, look after all the kids, cry a lot, eat surrounded by muck and have a long sleep. After a couple of weeks, he got smart and started to go to bed when he wasn't completely tired. He peed himself several times looking after those kids! But scrubbing the bath and sinks gave him enough points for a steel bladder and then he was on the up! Love this Sim!
If he makes it to 9 weeks, I'm putting him in a beautiful home in Summerhill Court and getting him a maid!