Budd, a.k.a. Sidewinder (portrayed by Michael Madsen), is Bill's degenerate younger brother who was recognized by Bill as 'the only man (he) ever loved', an epigraph etched onto Budd's sword. He was the only other male Deadly Viper Squad member and, since the assassination squad's disbandment, adopted a redneck-like lifestyle. Living in a mobile home where he steadily became an alcoholic, Budd makes ends meet by working as a bouncer at a local strip club. When told by Bill that Beatrix was coming to kill him, Budd philosophically stated ''That woman deserves her revenge. And we deserve to die. But then again, so does she.'' (When Budd makes this statement in Volume 1, the last sentence is not included; the full statement is spoken in Volume 2). Budd once owned a Hattori Hanzo katana and told Bill, who told Elle, that he had sold it for $250 in El Paso, Texas. He actually lied because The Bride later found the sword in a golf bag in the bedroom of Budd's trailer. During Bill and Budd's discourse, Bill mentions an unpleasant event between the two of them that led to their falling out, but the details of this event are never explicitly mentioned.

What's the best answer to this question: is budd bill's brother in kill bill?
yes