My wife and I went through it with her Mom a couple of yrs ago and yes it is terrible. Her Family didn't want to put her in a home so a few of them took turns caring for her and one of those that did was not very reliable as far as keeping an eye on her. She was able to sneak out of the house and made it all the way down a very long driveway out into the highway a couple of times.
Also on her watch she fell and hit her head and was hospitalized for a brain bleed, when she was released from the hospital the same family member took her home, left her on the front porch steps because she forgot to get her cell phone charger so she left her there while she retrieved it, yep she fell, broke her femur and an Ambulance came and took her right back to the Hospital that same day she was released. She passed away 4 days later at home hospice because she never woke up after the surgery. I believe that she was ok with that because she told them before it got really bad that she did not want to live because she knew it would get worse and she prayed that the Lord would just take her soon. He did.
My point is that people may say they can handle it or take care of them but most of them cannot. In my Wifes case they were not mad at their sister because she was pretty much the only one that could stay with their Mom because she was unemployed at the time, everyone else either had kids to deal with or full time jobs and could not help very much or any at all. I think she would still be here had they got her in a place where she could be looked after properly but who knows, she could have fallen there just as easily I guess.
I feel for you, its a terrible thing and hope I never have it, its not only tough on the individual but man it takes a toll on everyone else as well.