question: What is the place of birth of Peter Ebert's father?
context: [["Carl Ebert", ["Carl Anton Charles Ebert (20 February 1887 \u2013 14 May 1980), was an actor, stage director and arts administrator.", "Ebert's early career was as an actor, training under Max Reinhardt and becoming one of the leading actors in his native Germany during the 1920s.", "During that decade he was also appointed to administrative posts, both theatrical and academic.", "In 1929 he directed opera for the first time, and during the 1930s established a reputation as an operatic director in Germany and beyond.", "A strong opponent of Nazism, he left Germany in 1933 and did not return until 1945.", "Together with John Christie and the conductor Fritz Busch, Ebert created the Glyndebourne Festival Opera in 1934.", "Ebert remained its artistic director until 1959, though productions were suspended during the Second World War.", "In the 1930s and 1940s Ebert helped establish a national conservatory in Turkey, where he and his family lived from 1940 to 1947.", "In his later years Ebert held administrative posts in Los Angeles and Berlin, and was a guest director at opera houses and festivals in Europe."]], ["Obata Toramori", ["He was the father of Obata Masamori."]], ["Hilan Ebert", ["Hilan Verle Ebert, born March 21, 1903 in Alliance, Ohio, graduated from the U.S. Naval Academy in 1926."]], ["Traudl Ebert", ["Traudl Ebert( born 8 March 1936) is an Austrian fencer.", "She competed in the women's individual and team foil events at the 1960 Summer Olympics."]], ["Carl Ebert (field hockey)", ["Carl Ebert( born 3 February 1889, date of death unknown) was a German field hockey player.", "He competed in the men's tournament at the 1908 Summer Olympics."]], ["Michaela Ebert", ["Michaela Ebert( born) is a German female track cyclist, representing Germany at international competitions.", "She competed at the 2016 UEC European Track Championships in the team pursuit."]], ["Burkhard Ebert", ["Burkhard Ebert( born 4 July 1942) is a former German cyclist.", "He competed at the 1964 Summer Olympics and the 1968 Summer Olympics."]], ["Bryan Crimmins", ["Bryan Crimmins( 25 October 1919 \u2013 15 February 1998) was a former Australian rules footballer who played with Melbourne in the Victorian Football League( VFL).", "He was the father of Peter Crimmins."]], ["Peter Ebert", ["Peter Ebert (born 6 April 1918, Frankfurt am Main", ", Germany - d. 25 December 2012, Sussex, England) was a German opera director.", "Son of noted German director Carl Ebert who left Nazi Germany in 1934 with his son and moved to England, he was best known for his work with Glyndebourne Opera and the Scottish Opera where he staged over 50 productions from 1963 to 1980 and which brought him great success."]], ["Patrick Ebert", ["Patrick Ebert( born 17 March 1987) is a German professional footballer who plays as a right winger for Dynamo Dresden."]]]
supporting_facts: [["Peter Ebert", 2], ["Carl Ebert", 8]]
evidences: [["Peter Ebert", "father", "Carl Ebert"], ["Carl Ebert", "place of birth", "Berlin"]]
answer: Berlin