question: Who is the father of the director of film In The Line Of Duty 4: Witness?
context: [["Paul Brooke", ["Paul Brooke( born 22 November 1944) is a retired English actor of film, television and radio.", "He is the father of actor Tom Brooke."]], ["Yuen Woo-ping", ["Yuen Woo-ping (alias:", "Yuen Wo-ping;", "born 1945) is a Hong Kong martial arts choreographer and film director, renowned as one of the most successful and influential figures in the world of Hong Kong action cinema.", "He is one of the inductees on the Avenue of Stars in Hong Kong.", "Yuen is also a son of Yuen Siu-tien, a renowned martial arts film actor."]], ["In the Line of Duty 4: Witness", ["In the Line of Duty 4:", "Witness (aka In the Line of Duty) is a 1989 Hong Kong action film directed by Yuen Woo-ping, starring Donnie Yen, Michael Wong and Cynthia Khan.", "The film was released in the Hong Kong on 21 July 1989.", "The film is nominally part of the loosely connected \"In the Line of Duty\" and \"Yes, Madam!\" series.", "The alternative titles of this and other films in the series can be cause for confusion."]], ["Michael Dillon (I.R.S. revenue officer)", ["Michael Dillon was an officer of the US Internal Revenue Service, who is best known for being the only Internal Revenue Service( IRS) Revenue Officer to be killed in the line of duty."]], ["Gail Cobb", ["Gail Adrienne Cobb( August 17, 1950 September 20, 1974) was an American police officer from Washington, D.C., who was the first female police officer in the United States shot and killed while patrolling in the line of duty.", "She was also the first sworn female officer of the Metropolitan Police Department of the District of Columbia( MPDC) to have been killed in the line of duty."]], ["Inoue Masaru (bureaucrat)", ["Viscount was the first Director of Railways in Japan and is known as the\" father of the Japanese railways\"."]], ["Frank Hand", ["Detective Garda Frank Hand was killed in the line of duty by the Provisional Irish Republican Army on 10 August 1984."]], ["Christopher Hoban", ["Christopher G. Hoban( 1962\u20131988) was a New York City Police Department officer who was killed in the line of duty."]], ["James R. Barton", ["James R. Barton (1810?\u2013 January 23, 1857) was the second sheriff of Los Angeles County, California, and the first to die in office, in the line of duty."]], ["Obata Toramori", ["He was the father of Obata Masamori."]]]
supporting_facts: [["In the Line of Duty 4: Witness", 1], ["Yuen Woo-ping", 4]]
evidences: [["In the Line of Duty 4: Witness", "director", "Yuen Woo-ping"], ["Yuen Woo-ping", "father", "Yuen Siu-tien"]]
answer: Yuen Siu-tien