it is very heartening to hear about your father's condition. pancreatic cancer is often advanced when it is first found, very few pancreatic tumors can be removed by surgery. Patients whose tumor cannot be totally removed, but who have a blockage of the tubes that transport bile (biliary obstruction) must have that blockage relieved. Since he is jaundiced it seems that there is reblockage from the previous surgery.It is definately difficult to exactly predict when the end comes.It is better you take your father to Pain and palliative care
centre to atleast relieve him of his pain symptoms.