First let me say I will keep a good thought for you, your brother, and your family.
My husband has had a GI tube (a tube in his stomach) since he started chemo/radiation August of 2009. The nutrionist on my husbands team provided us with several options for prepared canned feeding. Unfortunately these all seemed to cause a lot of GI upset and discomfort. Ultimately we (the nutrionist and I) came up with a diet I could make at home in the blender. I actually preferred this to the canned nutrition, but I would not have taken it on without very clear guidelines from a professional. Since he has completed all of his treatments, and nausea and weakness is no longer an issue, my husband is now in charge of preparing his food. He pretty much eats whatever we (the kids and I) eat, it just goes into a blender with some organic whole milk or organic chicken broth.
Jen