Peter Hamel
Peter Hamel( 1911–1979) was a German screenwriter and a director of film and television.
He appeared as himself in the 1948 comedy" Film Without a Title".
He is the father of the composer Peter Michael Hamel.
Bert Grund
Bert Grund( 1920–1992) was a German composer of film scores.
Humshakal (1974 film)
Humshakal  is a 1974 Hindi movie directed by Jambulingam.
The film stars Rajesh Khanna, Tanuja, Moushumi Chatterjee, Asrani and Aruna Irani.
The music was by Rahul Dev Burman and lyrics were by Anand Bakshi.
The film was a remake of the 1970 Kannada film "Baalu Belagithu", which was also remade in Telugu as "Manchivadu" (1973) and in Tamil as "Oorukku Uzhaippavan" (1976).
The songs of the film were extremely popular with the Kishore-Asha duet song "Hum Tum Gum Sum" being on the top of the charts for more than a year.
The tune of the Rafi-Lata duet "Kahe Ko Bulaya" being even adapted as a religious song in subsequent decades.
Kishore Kumar considered the song "Rastaa Dekhe Tera Vyakul Man Mera" – close to his heart.
As per the review by The Hindu newspaper in 2016, the box office collections of the film were average and the film was hit at the box office.
The review quoted: "Apart from the double role act by Khanna and the decorative inclusion of the pretty Moushumi and Tanuja, it is R.D. Burman who stands out with some delightful compositions."
Walter Ulfig
Walter Ulfig was a German composer of film scores.
R. D. Burman
Rahul Dev Burman (27 June 1939 – 4 January 1994) was an Indian music director.
From the 1960s to the 1990s, Burman composed musical scores for 331 films.
Burman did major work with Asha Bhosle (his wife) and Kishore Kumar and scored many of the songs that made these singers famous.
He has also scored many songs sung by Lata Mangeshkar.
Nicknamed Pancham, he was the only son of the composer Sachin Dev Burman.
He was mainly active in the Hindi film industry as a composer, and also provided vocals for a few compositions.
He served as an influence to the next generation of Indian music directors, and his songs continue to be popular in India and overseas.
Tarcisio Fusco
Tarcisio Fusco was an Italian composer of film scores.
He was the brother of the composer Giovanni Fusco and the uncle of operatic soprano Cecilia Fusco.
Henri Verdun
Henri Verdun( 1895–1977) was a French composer of film scores.
Thomas Morse
Thomas Morse( born June 30, 1968) is an American composer of film and concert music.
Abe Meyer
Abe Meyer( 1901 – 1969) was an American composer of film scores.
Alonso Mudarra
Alonso Mudarra( c. 1510 – April 1, 1580) was a Spanish composer of the Renaissance, and also played the vihuela, a guitar- shaped string instrument.
He was an innovative composer of instrumental music as well as songs, and was the composer of the earliest surviving music for the guitar.

Question: Who is the father of the composer of film Humshakal (1974 Film)?
Answer: Sachin Dev Burman