When My father became an invalid, I just moved in to take care of him myself. (Of course it helped that my business was entirely internet based and I could do it anywhere)
In addition to helping him in order to maintain his dignity and emotional needs, It was easy to determine that financially it made sense. I wasn't making anywhere near the $5,500 a month that the local nursing home charged for a shared room, nor even the $4,000 a month that the "snake pit" in the nearest city charged. His financial status was such that there would be no "public aid" for him.
The four years I took care of him were pretty stressful for me, But, I figure I saved his "estate" $265,000. And even if I had been making $10,000 a month I might have made the same choice, because I was able to make his last few years more tolerable for him than if he had just been put out of sight and out of mind in some facility.