Do we have a case to sue for my father that had to have his leg amputated because of negligence in his Rest HM?

My father had a stroke 2 yrs ago that paralyzed him on his left side. Since then he has been residing at a Rehab/Rest Home where they are supposed to take care of him, exercise him daily, get regular check ups from Dr's and Nurses there, and get proper nutrition. Well last week they called us and told us our father had to get his leg amputated. His room mate confirmed a couple of weeks ago the nurses attempting to take my father out for daily exercise hit his foot so hard on something it bled and instead of them taking care of it, wrapping it cleaning it, they took him on to therapy. The foot got worse (nothing was done, we weren't notified) and so we got a call at the last minute saying he had to have a blood transfusion AND had to get his leg amputated. I think this in inexcusable since he is in their care 24/7 with Doctors and Nurses around that are supposed to be checking him everday. He has also went from 180lbs to 140. I live in PA and my father is in SC. Should we have a case and would kind of lawyer is best for such cases? Do i have to get one from SC or can i hire one from PA? Any good advice would be greatly appreciated