Question: What sport did a German father and son duo both play?

Context articles: 10DollarMall.com
Bart Carny
Dieter Zorc
Royaldutchshellplc.com
Ashok Chavan
Hasiru Honnu
Those Days (novel)
Peter Hillary
Michael Zorc
It's About You

10DollarMall.
com is an American electronic commerce company of fashion and casual lifestyle products, headquartered in Chula Vista, CA.
 The company was founded in 2007 by father son duo Daniel Maman and Steven Maman.
 The online retailer launched as a website in March 2011, but the company started operations at the end of 80's decade with a small store in San Diego, CA.
"Bart Carny" is the twelfth episode of "The Simpsons"<nowiki>'</nowiki> ninth season.
 It originally aired on the Fox network in the United States on January 11, 1998.
 Homer and Bart start working at a carnival and befriend a father and son duo named Cooder and Spud.
 It was written by John Swartzwelder, directed by Mark Kirkland and guest stars Jim Varney as Cooder the carny.
 The episode contains several cultural references and received a generally mixed critical reception.
Dieter Zorc (born 17 October 1939 – 16 October 2007) was a German football defender.
 He was the father of Michael Zorc.
royaldutchshellplc.com is a Royal Dutch Shell gripe site and blog operated by Alfred and John Donovan, who engaged in several marketing campaigns with Shell during the 1980s and early 1990s.
 The father and son duo believe Shell violated intellectual property agreements and filed several lawsuits against Shell prior to starting several websites critical of Shell, including royaldutchshellplc.com.
 The site has been oft quoted in news sources and is known for its activities as an Internet leak and forum for Shell whistleblowers.
Ashok Shankarrao Chavan (born (1958--) 28 1958 (age 59 ) ) served as the Chief Minister of Maharashtra from 8 December 2008 to 9 November 2010.
 He earlier served as Minister for Cultural Affairs, Industries, Mines and Protocol in the Vilasrao Deshmukh government.
 Chavan is son of former Chief Minister of Maharashtra Shankarrao Chavan and they are the first father–son duo in the state's history to become chief ministers.
Hasiru Honnu("Green Gold") is a science fiction novel by B. G. L. Swamy.
 This book won him the Kendra Sahitya Academy award given by the Government of India.
 As a result, Gundappa and Swamy became the first father and son duo to win this award.
Those Days (Bengali: ) is an award-winning historical novel by Sunil Gangopadhyay.
 It was first published as a serialized novel in Bengali literary magazine "Desh".
 Sunil Gangopadhyay won Sahitya Akademi Award for this novel in 1985.
 The story of the novel centers around many historical figures including Ishwar Chandra Vidyasagar, the reformer; Michael Madhusudan Dutt, the poet; the father and son duo of Dwarkanath Tagore and Debendranath Tagore; Harish Mukherjee, the journalist; Keshab Chandra Sen, the Brahmo Samaj radical; David Hare and John Bethune the English educationists, and others.
Peter Edmund Hillary (born 26 December 1954) is a New Zealand mountaineer, philanthropist and writer.
 He is the son of adventurer Sir Edmund Hillary, who, along with Nepalese Sherpa mountain climber Tenzing Norgay, completed the first successful ascent of Mount Everest.
 When Peter Hillary summited Everest in 1990, he and his father were the first father/son duo to achieve the feat.
 Hillary has achieved two summits of Everest, an 84-day trek across Antarctica to the South Pole, and an expedition guiding astronaut Neil Armstrong to land a small aircraft at the North Pole.
 He has climbed many of the world's major peaks, and on 19 June 2008, completed the Seven Summits, reaching the top of the highest mountains on all seven continents, when he summited Denali in Alaska.
Michael Zorc (born 25 August 1962) is a German retired footballer who played as a central midfielder.
It's About You is a 2012 music documentary film directed by father and son duo Ian & Kurt Markus.
 The films focus regards John Mellencamps 2009 tour with Bob Dylan and Willie Nelson and the recording of his new album in the month and a half of the tour.