When the social worker comes:
Pause the game
Press Ctrl-Shift-C
Type in 'boolprop testingcheatsenabled true'
Shift click the social worker
Click 'More' until you see 'Force Error'
Click 'Force Error'
When a box comes up saying there's been an error, press 'Delete'
Do the same with her car
Press Ctrl-Shift-C and type 'boolprop testingcheatsenabled false'
Unpause the game
There! You've just gotten rid of the social worker.
You can do the same to burglars and the repo man.
Storyteller and lover of ridiculously overcomplicated plotlines. Very inactive and not especially interested in the Sims anymore (my game's been bugged out for months anyway).