Robin, I really feel for you. My mom died this past April after having been diagnosed with Alzheimer's nine years ago. It was very, very difficult for her to give up her independence; luckily, my dad is very healthy and was incredibly supportive of her the entire time. I'm sure that the changes you've helped your dad make have prevented his problems from being any worse, and hopefully he has a good doctor who can support you in your efforts.
It's heart wrenching to see our parents decline. My sympathies.
You make your choices, and you live with them. In the end, you are those choices.
"Strength is the mental and physical fortitude to endure, resilience to bounce back, and force to create change, allowing you to thrive in any circumstance and through any adversity." TrPAssassin