Hi Bose
I know what you mean...surely your asking for advises because of your dad suffering at the moment.
I wasnt mocking with you please no offence but honestly hands on heart there are really really great people on here whom have excellent knowledge of what your asking, maybe they are suffering with the same issues as your dad or maybe not but they have been going through many or similar problems them self or through their members of family.
Some of them already replied to you but possibly clearly your mind were busy, maybe you were upset etc maybe that's why you didn't understand their questions or maybe you didn't see their comments.
I cannot suggest anything else All I had RP operation and tried to educate my self from here with people Advises whom some of them already tried to help you on this thread as well.
But if you think their comments were not helpful.please may I suggest you to find specialist volunteers nurses(Macmillan's) on this website please send them messages than Wait for their answer .they could answer you definitely. Maybe it will take 2 or 3 days but they will definitely answer you .I already tried my self and greatly they helped me out about my problems.
Good luck mate
D.R