People in these situations should learn about codependency.
Although most people think of codependency in terms of unhealthy love relationships, it is also common for caregivers.
The idea is NOT that you should stop caring, or walk away.
It is sort of adopting a "healthy neutrality" frame of mind, and give/function well.
Good Point;
Wikipedia - https://en.wikipedia.org/wiki/Codependency The description talks about negative aspects but we need to understand the essence and apply it constructively to caregiving where both are codependent on each other though it is imbalanced.
Codependency: Are You Caretaking or Caregiving? - https://www.simplypsychology.org/caretaking-vs-caregiving.ht...
Finally, note that there is always a overlap between caregiving and caretaking and things are never clearcut as the textbook definitions may imply.
"Codependent no more" - Melanie Beattie. Changed my life.