I would *definitely* talk to your father's doctor. There are a lot of conditions that could be causing your father's apathy. The doctor would hopefully know how to phrase things. He's not going to say 'Oh, your daughter told me that you don't fix the house up.'

I don't think that you need to confront your father or that it will actually have much effect if you do. I would only insert myself in that situation if my mother asked me specifically to help convince my father to let her get a job or move or fix the light in the kitchen. I guess I am just thinking of personal experiences where these kinds of interventions have backfired.

In one situation like that, we did organize a work day, where the whole family gathered to fix up the place. The husband tolerated it and seemed pleased by the results. I hope you have good results also if you do something similar.