How can we get Dad to do something about his gambling and incontinence problems?

I'm at a loss at what to do. My mom died about 7 months ago and my 87 year old father insists on living by himself and refuses help. He does not cook, clean, do bills, get his medications, or do laundry. He has his share of health problems - colon cancer, a stroke, hypertension, diabetes, but can shuffle around OK.

Here's the problem: my dad's primary interest is gambling. He tries to go to a casino 4-5 times a week to play keno (the closest one is 2 hours away). He can afford it - that's not the problem. The problem is that gambling has become his life. When playing, he will not eat, drink or go to the bathroom. He is incontinent of urine and stays in the casino (and elsewhere) with wet pants. He won't change his clothes without prompting and refuses to wear Depends. He's been to specialists about this issue, but does not follow up on their suggestions.

The gambling and incontinence behaviors are driving me and my siblings crazy. Dad is "competent" and people tell us he is "grieving", so they feel whatever makes him happy is fine. I'm not sure I agree.

Any thoughts or suggestions? Thank you!