I had almost the same problem. Ashley mi problem is the nannys, I mean it´s a game problem or something that makes nannys sometimes don´t wanna leave the home when they should. I tryed to fire her but she doen´t wanna go, then I hired a new nanny, and both of them didn´t wanna leave the home!! So I had two nannys walking around the house all day, and being stinky because they didn´t take a shower during days. The first time I resolved to move the family to another house, and I fixed the problem, the second time nannys were so annoying that I used "move_objects on" to delete them....
Well the thing is that besides nannys were all the time at home, dad and mum didn´t wanna go home because they didn´t wanna leave kids "home alone".
Let me see, I´ve heard about a "hack" or something like that that could solve this problem, but I didn´t test it, so I don´t know if it really works.
If I´m ok I did read about this on the sims2 oficial site:
http://thesims2.ea.com/I´m not sure, but try there.