Question: What is the date of death of Rikky Von Opel's father?

Knowledge 1: Rikky von Opel
Frederick "Rikky" von Opel (born October 14, 1947) is a former racing driver from Liechtenstein, the only driver from that nation to have competed in the Formula One World Championship.He won the Lombard North British Formula 3 Championship in 1972.He participated in 14 Formula One World Championship Grands Prix for the Ensign and Brabham teams, debuting on July 1, 1973.He scored no championship points.He is the son of Fritz von Opel and a great-grandson of Adam Opel, the founder of the German car-maker Opel, today a subsidiary of Groupe PSA. [SEP] Knowledge 2: Fritz von Opel
Fritz Adam Hermann von Opel (4 May 1899 – 8 April 1971), known as Fritz Adam Hermann Opel until his father was ennobled in 1917, was the only son of Wilhelm von Opel and a grandson of Adam Opel, founder of the Opel company.He is remembered mostly for his spectacular demonstrations of rocket propulsion that earned him the nickname "Rocket Fritz".
Knowledge 1: Rikky von Opel
Frederick "Rikky" von Opel (born October 14, 1947) is a former racing driver from Liechtenstein, the only driver from that nation to have competed in the Formula One World Championship.He won the Lombard North British Formula 3 Championship in 1972.He participated in 14 Formula One World Championship Grands Prix for the Ensign and Brabham teams, debuting on July 1, 1973.He scored no championship points.He is the son of Fritz von Opel and a great-grandson of Adam Opel, the founder of the German car-maker Opel, today a subsidiary of Groupe PSA. [SEP] Knowledge 2: Etan Boritzer
Etan Boritzer( born 1950) is an American writer of children ’s literature who is best known for his book" What is God?" first published in 1989.His best selling" What is?" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.Boritzer gained national critical acclaim after" What is God?" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.The other current books in the" What is?" series includeWhat is Love?,What is Death?,What is Beautiful?,What is Funny?,What is Right?,What is Peace?,What is Money?,What is Dreaming?,What is a Friend?,What is True?,What is a Family?,What is a Feeling?"The series is now also translated into 15 languages.Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.Boritzer now lives in Venice, California and maintains his publishing office there also.He has helped numerous other authors to get published through" How to Get Your Book Published!" programs.Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.He is also recognized nationally as an erudite speaker on" The Teachings of the Buddha."
Knowledge 1: Rikky von Opel
Frederick "Rikky" von Opel (born October 14, 1947) is a former racing driver from Liechtenstein, the only driver from that nation to have competed in the Formula One World Championship.He won the Lombard North British Formula 3 Championship in 1972.He participated in 14 Formula One World Championship Grands Prix for the Ensign and Brabham teams, debuting on July 1, 1973.He scored no championship points.He is the son of Fritz von Opel and a great-grandson of Adam Opel, the founder of the German car-maker Opel, today a subsidiary of Groupe PSA. [SEP] Knowledge 2: Hans von Opel
Johann Jakob"Hans" Opel (from 1918 von Opel; 27 Jule 1889 – 25 June 1948) was a German industrialist from the Opel family.Johann Jakob von Opel was the nephew of the car fabricant Adam Opel and son of Carl von Opel and Helene Wilhelmine Mouson.When his father Carl was raised upon the nobility, this also applied to his descendants and he was allowed, to go by the name "von" Opel.Hans von Opel and Salomon Meyer were the founders of the "Hansa finance corporation" for car trading companies, which developed to a leading German holding and finance company.His wife was Sophie von Opel-Hübscher (1902–1989).After the early death of her husband, she married Karl Binding of the same name of the traditional brewery family.Hans von Opel left her wife a considerable capital, which later formed the basis for the Sophie and Karl Binding foundation.Hans von Opel was an honorary member and part of the Corps Franconia Darmstadt.

Answer: 8 April 1971