Sally,
I am sorry to hear that your brother is having to go threw so much! I was one of the care givers for my Mom and her cancer came back three times so I know how your family must be feeling. My Mom did get a peg tube put in right away before she even started treatment. She didn't have a lot of weight to loss so they didn't want to take any chances. The peg tube procedure itself wasn't too bad. We all got pretty use to helping her with her feedings and giving her all of her medication in it. She didn't eat by mouth for over a year and a half so it did help!
I wish your brother and your family the best of luck. He will certainly need your help and support.
This site was a wonderful way for me to find help and just talk to other people going threw it.
Thoughts & Prayers
Debbie