I have done the snow goose hunt a few times in the past and had very good days and some days that were...so, so at best. Since it is your brother and you, luck may be on your side. Most of the times you share a blind with a person that was also picked for that particular blind. Sometimes you luck out and get drawn with some good individuals; neophyte hunters that want to learn, experienced guys that have decoys and that can use a snow goose call. Every now and then you get a major loser: I got drawn to a blind with three other guys - two of them were son in law and father in law, the other was what turned out to be a real number. He at least had about a hundred new TX rags but his camos (head to foot) were brand new. Since I was the only one with experience in snow goose I was asked about calling. I told them for now, just to say a throaty Haa into the call. The related two asked if they didn't call would it matter; I said that bad calling was worse than no calling. Then, Camo Boy chimes in with, "the back of the package of my call said to say "GGGRRAAAA" into it. I told him to listen to the birds above and mimic that; "No, I am going to say "ggrraaa". With my rags and with my silos we had close to two hundred decoys out there. The birds would start to coming in but brains at the other side of the blind started doing the gggrraa very loud and a least several to a dozen times. This went on more than a couple of flocks of snows. Finally, I said that the birds weren't very vocal so better not call but by that time it the birds really stopped paying attention to us and surrounding blinds. However, the coup de grace was when this jerk stood up and peep in the blind. The blind has a concrete floor the the stream of pee started to run down to us three. The guy next to him started to build a dirt dam with his boot between him and the pee master. Us other two were pushing up dirt with our feet to help him. When the manager came by to check on us at around 10:00 and see if we wanted a ride to our vehicles the three of us said yes.
Having said that; bring some decoys - TX rags are available and work fairly well. You can get shells but it is a little more expensize. Bring camo material; the blinds are boxes placed over concrete ditches and you need to cover them. Have fun and good luck.
Living large in the southwest.