Respectfully.... what's wrong with family? These times when a loved-one needs help can be the most rewarding for a carer.
Some may have already answered this good question but I would just add that in terms of 24-hour care and safety some elderly people need to be in residential care facilites such as specialist dementia units.
It is too unsafe for them to be at home, often requiring 24-hour supervision and frankly sometimes well-meaning family members do the exact opposite of what is helpful with elderly people who are suffering from neuro-degenerative disorders. Besides, in my own extended family, relatives decided to care for their aged mother in their small apartment. On one unforgettable occasion, one relative was home with the mother, turned their back for a few minutes, neding to atend to something else and when they came back, the mother had locked herself in the bathroom and turned on all the taps and refused to come out. On another occasion, one of them forgot to lock the apartment door, the mother got out, climbed down the stairwell and was "lost" for several very worrying hours (she was later found wandering around a local park and no one knows how she got there.
Placing the elderly in residential facilities is not necessarily a sign of lack of caring for a family member but often simply a reflection of the increased life expectancy in many countries. In earlier generations, people died earlier - especially when they had degenerative disorders. Nowadays the level of care is such that the life expectancy of those diagnosed with a dementia disorder (for example) is much longer than in earlier decades.
The problem then becomes one of appropriate hospital-level care.