It seems to me that you can defined a caretaker as someone whos being paid to look after a person, animal, things, or a place. If the caretaker and patient cross the set boundaries, it might lead to codependency or a mental, emotional, and physical reliance on the caretaker. This can ruin a healthy relationship and can be harmful not only to the patient but to anyone involved. I recommend to have a look at this medical resource about caretaker meaning to have more details in front of you