Hello Maurice,
I noticed in your message you indicated you have been searching the web and reading about your brother's situation. If I'm assuming correctly, then you are fully aware that a Klatskin Tumor is a very serious situation.
Due to the fact that his doctor said the tumor was inoperable, this in itself is not good. It may be the stent was inserted to allow the bile to flow out of his liver and give him a little better quality of life. Miracles can and do happen, but when a Klatskin Tumor is inoperable, it may mean it a lot more than the two tumors in the Hepatic ducts...the cancer may have spread to other organs.
Radiation Therapy as well as Chemo are usually not the first approach to control this type of cancer tumor. If he feels like the akelein diet will help, allow him to do it.
I'm very sorry to hear what your brother is going through, keep in mind...it may get a lot worse and harder for him and the family.
Good luck and take care of yourself....it's a very deadly illness.
Leonard, Alamo California