<Li> Doc Platter--Doc is Peggy's father . He makes only a single major appearance when Peggy, Bobby and Hank visit the family ranch . He seems to be going somewhat senile and preachy, which Hank misinterprets as old - fashion Western - style wisdom . </Li> <Li> Junichiro (voiced by David Carradine)--Junichiro is Hank's elder half - Japanese half - brother who has lived in Japan all his life . Hank and Junichiro have the same father, due to Cotton's affair with a Japanese nurse during his war days, and share many similarities in appearance and mannerisms (this in spite of the fact that Hank actually shares more of his mother's features); one of these is that when he is shocked, like Hank, he yells "BWAH!" Like Hank, Junichiro also has a narrow urethra and is an assistant manager at the company for which he works, making robots and robot accessories . </Li> <Li> Dusty Hill (Himself)--The bassist / vocalist for the band ZZ Top and Hank's cousin . In the episode "Hank Gets Dusted," Cotton gives his prized Cadillac to Dusty without allowing Hank a chance to buy it . Dusty enters the car in a demolition derby in which it is badly damaged . Hank and Dusty make their peace after Dusty has the car repaired and installed at the Cadillac Ranch . </Li> <Ul> <Li> Nancy Hicks - Gribble (voiced by Ashley Gardner)--Nancy (née Hicks) is Dale's wife, Joseph's mother, and weather - girl - turned - anchor for local news station Channel 84 . She had a fourteen - year affair with John Redcorn, which produced her son, Joseph, although she eventually broke off the affair and became a faithful wife to Dale . Redcorn refused to come back to her out of respect for Dale . Her mother Bunny was similarly unfaithful to Nancy's father, but did not reveal her own long - term affair until Nancy began suffering from stress - induced hair loss over her unresolved feelings for John Redcorn . Nancy is a former beauty queen, a fact which helped her get her job as a news anchor . </Li> <Li> Joseph John Gribble (voiced by Brittany Murphy in 1997 - 2000, Breckin Meyer in 2000 - 2009)--Dale and Nancy's 13 - year - old son and one of Bobby's best friends . Despite Joseph's obvious Native American features, his similarity in appearance to John Redcorn, and the fact that his middle name is "John," neither he nor Dale is aware that Redcorn is his biological father (Nancy refers to Dale having a "Jamaican grandmother" to explain Joseph's dark complexion). Redcorn's occasional and awkward attempts to get closer to Joseph (against Nancy's wishes) lead Joseph to regard him as strange and creepy . Joseph starts out as an ordinary teen, but eventually grows weird and creepy--not to mention dim - witted . Joseph begins to take after Dale more than John, Nancy or even any of his friends . Joseph has a half - sister named Kate (by John Redcorn having another affair), who is very similar to Joseph in personality and interests but likewise does not realize that Redcorn is their father . Joseph is the only character of the series shown to physically mature, having grown six inches in height over the course of a summer, a more built physique, athletic prowess and having a deeper voice and a wispy mustache upon his reappearance . It is implied in the episode "Spin the Choice", Nancy finally told Joseph the truth . Joseph and John Redcorn seem to now share a genuine relationship . </Li> <Li> Bug Gribble (voiced by David Herman)--Bug is Dale's father, who had been estranged from Dale for many years for kissing Nancy at her and Dale's wedding reception . Bug is actually gay and had been flirting with a Filipino caterer instead, and, upon sensing Dale's imminent entry into the room, attempted to hide his orientation from his son by grabbing and kissing' the nearest thing in a dress' . This misunderstanding, and Bug's inability to reveal his true sexuality to Dale, resulted in their estrangement . When Dale and Nancy renew their wedding vows 20 years afterward, Nancy arranges to invite Bug, and Dale initially suspects his odd behavior and his having a "partner" of meaning that Bug is an undercover government agent, but finally accepts the truth upon seeing Bug and his partner share a devoted kiss . Bug's appearance in "My Own Private Rodeo" retcons his appearance in earlier episodes, where he bears a near - identicality to present - day Dale . </Li> </Ul>

Who does the voices of king of the hill