Question: Balthazar Getty is a member of the family that was heavily involved in what industry?

Context paragraphs:
Sol Goode: Sol Goode is a 2001 American romantic comedy film directed by Danny Comden.  The lead role of Sol Goode is played by Balthazar Getty; other cast include Katharine Towne, Jamie Kennedy, Danny Comden, and Cheri Oteri.  The film features cameo appearances including Jared Leto, Carmen Electra, Jason Bateman, and Shannon Leto.

John McIntyre (politician): Sir John McIntyre (24 April 1832 – 18 January 1904) was a Scottish born Australian politician and businessman.  After emigrating to Australia during the Victorian gold rush, McIntyre became heavily involved in the mining industry around Bendigo.  Later as he began to rise in prominence he became involved in local politics, eventually becoming the first mayor of Bendigo, a post he held for five years before resigning.  In the years following he became heavily involved in community work, serving as a territorial magistrate and children's guardian for the Bendigo district.  In 1877 he was elected to the Victorian Parliament as the Member for Sandhurst.  Although he later lost this seat in 1880, he re-entered parliament in 1881 after winning the seat of Maldon in a by election.  He held this seat until 1902, serving as a minister during the Patterson premiership and as Leader of the Opposition from 1895 to 1898.  In December 1903 he stood for the Australian Senate but narrowly failed to win a seat.  Suffering from ill health, he died shortly afterwards.

Tommy Walker (Brothers &amp; Sisters): Thomas "Tommy" Walker is a fictional character on the ABC television series "Brothers & Sisters".  He is portrayed by Balthazar Getty.  In a 2010 episode, actor Cody Longo portrayed a teenage Tommy in flashback sequences set in 1986.

Ringside: Ringside is an indie rock band from Hollywood, California, originally formed in Los Angeles.  They specialize in fusing indie rock with electronic beats.  The band consists of Scott Thomas, (vocals, guitar, and keyboard), Kirk Hellie (guitarist), Sandy Chila (live drums), Max Allyn (live keys), and actor Balthazar Getty, who doubles as a beatmaker and producer.  Scott Thomas' inspiration came from artists like The Stooges, The Clash, T. Rex, and Depeche Mode.  Thomas eventually collaborated with Getty, who was already into making beats for underground hip-hop groups.

John Paul Getty III: John Paul Getty III ( ; 4 November 1956 – 5 February 2011), also known as Paul Getty, was the eldest of the four children of John Paul Getty, Jr. and Abigail (née Harris), and the grandson of oil tycoon Jean Paul Getty.  His son is actor Balthazar Getty.

Slingshot (film): Slingshot is a 2005 American independent crime film directed by Jay Alaimo and written by Alaimo & Matt Fiorello and Matthew Quinn Martin.  Story by Martin.  It stars David Arquette, Thora Birch, Balthazar Getty and Julianna Margulies.

Out in Fifty: Out in Fifty is a 1999 independent film directed and written by Bojesse Christopher and Scott Leet, which also stars in this film together with actor Mickey Rourke.  Film also stars Peter Greene, Ed Lauter, Balthazar Getty, James Avery and Christina Applegate as "Lilah".  A central role is developing by Nina Offenböck, the gorgeous Swedish actress, as Gloria.  It is an action packed psychologicial thriller film.

Julia Walker: Julia Walker is a fictional character on the ABC television series "Brothers & Sisters".  She is portrayed by Sarah Jane Morris.  A regular cast member on the series for the first three seasons, Julia's storylines revolved around her and her husband Tommy (Balthazar Getty) problems surrounding their daughter Elizabeth, who was Tommy's brother Kevin (Matthew Rhys) child through a donation of sperm due to Tommy's infertility.

Balthazar Getty: Paul Balthazar Getty ( ; born January 22, 1975) is an American actor, member of the band Ringside, the producer-half of rap duo The Wow, and a member of the Getty family.  He is known for having played the roles of Ralph in "Lord of the Flies", Thomas Grace on the American action drama "Alias" and Tommy Walker on the American drama "Brothers & Sisters", the latter two of which have aired on ABC.

Getty family: The Getty family of the United States identify with George Franklin Getty and his son Jean Paul Getty as their patriarchs.  In the 20th century they were heavily involved in the petroleum industry.  The Getty family is of Scots-Irish ancestry of the Methodist faith from the patrilineal lineage, their ancestors having migrated to North America from Cullavmor, in what is now County Londonderry.  Several members of the Getty family have lived in England, including Sir Paul Getty who took British citizenship.  The Getty family is distantly related to Samuel Gettys, founder of Gettysburg, Pennsylvania.

Supporting paragraphs: Balthazar Getty Getty family
Answer: petroleum