Very sorry to learn that your brother in law is suffering from cancer and most likely it is pancreatic cancer.Since he was not a surgical candidate,your brother in law was subjected to radiation and chemotherapy
.biliary stenting means that bile duct got blocked because of local advancement of cancer resulting in pressure on bile duct from surrounding mass of cancer.
Whipple's procedure was also cancelled because doctors must have realised that locally cancer was very much advanced and surgery is not feasible.
Since all near structures are matted with cancerous cells,no surgery is possible.
You should not disturb anything now and let live your brother in law peacefully in his final journey.
Overall, pancreatic cancer has a poor prognosis. Of all those people diagnosed with pancreatic cancer, only 20% are alive 1 year later. Sadly, only about 5 % live for 5 years after diagnosis.
For people diagnosed with locally advanced disease, which cannot be removed by an operation, the average life expectancy is about 7 months. For people whose cancer has already spread to another part of their body, the average life expectancy is only a few months.