Question: What Stratford-based football club has Mike Keen's son played for?

Context paragraphs:
Jeff Christensen: Jeffrey Bruce Christensen (born January 8, 1960) is a former American football quarterback in the National Football League.  He played for the Cincinnati Bengals, Philadelphia Eagles and Cleveland Browns.  He played college football for the Eastern Illinois Panthers.  His son played college football at Iowa and Eastern Illinois.

Terry Jones (defensive tackle): Terry Wayne Jones (born November 8, 1956 in Sandersville, Georgia) is a former American football defensive tackle in the National Football League.  He played his entire career from 1978 to 1984 for the Green Bay Packers.  His son played tight end in the NFL for the Baltimore Ravens and the San Francisco 49ers

Gorden Kelley: Gorden Bond Kelley (June 11, 1938 – October 22, 2015) was an American football linebacker in the National Football League for the San Francisco 49ers and the Washington Redskins.  He played college football at the University of Georgia.  He was married to Charlotte and had two children, son Gordon Jr. and daughter Mary.  The son played college football in Virginia.  After retirement, he worked in real estate as well as owning a furniture store in Ocean Ridge, Florida.

Harry Sellars: Harold Sellars (9 April 1902 – 30 December 1978) was an English footballer, who played in the Football League for Stoke City.  He made 395 appearances for Stoke in all competitions, and helped the club to win the Third Division North title in 1926–27 and the Second Division title in 1932–33.  His son John also played for Stoke in the 1950s.  Together, father and son played 808 league and cup games for the club.

Sedan Cambrai Football Club: Sedan Cambrai Football Club are an Australian rules football club based in the Murraylands region of South Australia that were initially formed in 1922 as Cambrai Sedan, a merger between the Sedan Football Club and the Cambrai Football Club.  The club initially participated in the Murray Ranges Football Association, temporarily shifting for one season (1925) to the Murray River Football Association before returning and in 1930 were renamed to Sedan Cambrai.  In 1936 the club went into recess until after World War II, when in 1947 it reformed and joined the Barossa & Murray Valley Football Association, lasting for four seasons before going into recess again in 1951.  In 1955 the club reformed again and returned to the Barossa & Murray Valley Association.  Sedan Cambrai had a short affiliation with the Gawler and District Football Association's AII competition from 1957-1958 before shifting to the Torrens Valley Football Association AII competition in 1959.  When the TVFA merged into the new Hills Football League in 1967, Sedan Cambrai joined the Northern Division and then were placed in the Division 2 competition when the Hills League was restructured in 1972.  In 1975, Sedan Cambrai merged with the Mount Torrens Football Club to form the Mount Torrens Cambrai Football Club.  This merger would only last for ten years before the club split back into Sedan Cambrai and Mount Torrens in 1986.  The reformed Sedan Cambrai entered the Mid Murray Football Association and played in that competition until it disbanded at the end of the 2009 season when they returned to the Hills Football League Country Division (Division 2).  In 2015, Sedan Cambrai was voted out of the Hills Football League Division 2 competition by member clubs and were initially pushed into the C-Grade competition.  They were reinstated for the 2015 season before shifting to the Riverland Independent Football League in 2016.

West Ham United F.C.: West Ham United Football Club is a professional football club based in Stratford, East London, England.  They compete in the Premier League, the top tier of English football.  The club re-located to the London Stadium in 2016.

Ashley Fernee: Ashley Fernee (born 24 June 1977) is a former Australian rules footballer who played in the Australian Football League (AFL).  He was selected for the Adelaide Football Club in the 1995 draft, having previously played with the Calder Cannons.  Fernee only played two games for the Adelaide Football Club in 1996, debuting against Fitzroy Football Club in round 17.  In spite of those two games, he was not selected to play in 1997, and in 1998 things were not looking promising, with Michelangelo Rucci stating that the "wait will go on unless a long injury list strikes again".  Fernee did not play in 1998, and he was delisted by the Adelaide Football Club in October of that year.  He played for the SANFL team, South Adelaide Football Club, in 1999, and nominated for the AFL draft at the end of the season.  Unsuccessful, Fernee left Adelaide to return to Victoria, where he played for the East Keilor Football Club.

Ivan Henjak: Ivan Henjak (born 9 March 1963 in Republic of Croatia) is an Australian former professional rugby league footballer and coach.  A New South Wales Country representative half back, Henjak played his club football in the NSWRL premiership with the St. George Dragons, Canberra Raiders and Western Suburbs Magpies.  He later became head coach for the Brisbane Broncos of the National Rugby League, the second ever, having taken over from Wayne Bennett in 2009.  Henjak is also the uncle of Australia international rugby union player Matt Henjak, while Henjak's son played front row for Australian Schoolboys.

Paul Johnson (Australian footballer, born 1984): Paul A. Johnson (born 26 June 1984) is an Australian rules footballer currently listed with the East Perth Football Club in the West Australian Football League (WAFL).  He previously played senior matches with the West Coast Eagles, the Melbourne Football Club, and the Hawthorn Football Club in the Australian Football League (AFL), the Swan Districts Football Club in the WAFL, and the Sandringham Football Club and the Box Hill Football Club in the Victorian Football League (VFL).  Johnson was the winner of the 2005 J. J. Liston Trophy, as well as the 2012 Simpson Medal as the best player in an interstate match for Western Australia.

Mike Keen: Michael Thomas "Mike" Keen (19 March 1940 – 12 April 2009) was an English former footballer who played during the 1960s and 1970s.  He was the father of former West Ham United and Stoke City player Kevin Keen.

Supporting paragraphs: Mike Keen West Ham United F.C.
Answer: West Ham United Football Club