That stinks. I think I would start looking for another job. You have enough pain from the loss of your Dad, who needs to deal with that kind of frustration on top of everything else.
When my Dad became ill(Sep'04), I quit my full time job a few months later.(I wanted to reduce my hours mainly because of child care issues, and I was told no). I was very nervous thinking about leaving a company that I had been at for over 10 years. I liked my coworkers, the job in general...I just couldn't deal with unsupportive management so I decided to leave. I decided to stay home with my kids and help my Dad, and my Mom. My Dad passed away Sept. 6, 2005, I miss him terribly.
Quitting my job enabled me to spend more time with my Dad so I was glad about that. Leaving work ended up not being as scary as I thought.
Take care,
Jackie