Sharon,
your brother is very lucky to have you by his side.
After he recovers from his surgery, you can still have several different opinions about the course of treatment, do not hesitate to listen to as many doctors as you feel is necessary. Also, regardless of whether or not he will need a peg tube (I didn't have one), it's crucial to meet with a speech and swallow specialist or just at least to have someone walk him through the exercises necessary to maintain his ability to swallow as even if he doesn't have a peg, he'll have a nasal tube for a bit, plus he will only be swallowing liquids.

And also, things will get better as he recovers from surgery, and then much worse as he is hit by radiation and possibly chemo, and from there the road to recovery is veeeerrrryyy slow. But he needs to eat, drink, brush his teeth, and not shy away from pain medication.

I'm not a frequent poster on this site, but I'm a frequent reader. With rare exceptions, everything I was looking for, I was able to find here.

Get your brother a bunch of notepads and pencils because for a while it will be his only way to communicate with doctors, nurses, and family. My friends gave me a iPod touch so that I could keep in touch via email while in the hospital.

I hope your brother's surgery goes smoothly. Mine was 11 hours long, it's exhausting for everyone involved. So be prepared.