Well...I know part of it. Nien Nunb is the Sullustan copilot of Grey Leader (a.k.a. Millennium Falcon) during the battle of Endor. Now who his brother is......I'm sorry I don't know that. I do know of an Aril Nunb, who is Nien's sister. She joined Rogue Squadron, and almost made it to executive officer.
Apparently sullustans are naturally excellent pilots.
Let's see....what hasn't been asked yet......
Q: In the final duel of The Last Command, who was all involved in the lightsaber duel, and who held who's lightsabers?