Can i seek legal action?

My uncle has ALS and needs everyday attention for his needs at home, which is ok for the matter that he would have 1 to 2 years left at the least as he continues to get the right help at home, his caretaker is his wife but she is unable to do it as she had surgery herself, so they setup a so called plan with a nearby hospice, where they would give her a 5 day break from the caretaking, while in the meantime his wife trys to find alternative help after hes released in the 5 days. Now while he is at the hospice, hes in some pain from the ALS, so they give him some medicine which i truly believe is a form of morphine, which knocks him in a vegetable state for the most part. The pain medicine he takes at his house does the job for his pain and there was no need for him to need morphine at the hospice ( the hospice did say he was taking the same meds as he was taking at the house, which is a lie because whatever they gave him put him in a vegetable state) , and thus he is in this vegetable state, he only eats once i think, since they cant give him any ivy or he instantly dies, well nonetheless he was only there 3 days and they call us saying he passed away. Now i know they did something there that killed him as he was not on his way out, he was only there because to give his wife a 5 day break from caregiving. I would bet all my money that they gave him a form of morphine which he did not need and of which destroyed him during his 3 days there, and when i say a vegetable state, i mean completly out of it, cant eat, etc. Does it sound like i have a good case, and that i can seek legal action against this hospice?