Question: Franco Alesi's racing driver son participated in the 1991 German Grand Prix, held where?

Context articles: Jean Alesi
1991 German Grand Prix
Peter Westbury
2013 German Grand Prix
1959 German Grand Prix
1968 Grand Prix motorcycle racing season
John Taylor (racing driver)
Klenk
Christian Goethals
1974 German Grand Prix

Jean Alesi (born Giovanni Alesi; 11 June 1964) is a French racing driver of Italian origin.
 His father, Franco, was a mechanic from Alcamo, Sicily, and his mother was from Riesi.
The 1991 German Grand Prix was a Formula One motor race held at Hockenheimring on 28 July 1991.
 It was the ninth round of the 1991 Formula One season.
 The 45-lap race was won by Williams driver Nigel Mansell after he started from pole position.
 His teammate Riccardo Patrese finished second with Ferrari driver Jean Alesi third.
Peter Westbury (26 May 1938 – 7 December 2015) was a British racing driver from England.
 He participated in two World Championship Formula One Grands Prix, scoring no championship points.
 In 1969 he raced a Formula 2 Brabham-Cosworth, driving in his first Grand Prix in the 1969 German Grand Prix.
 He finished ninth on the road, fifth in the F2 class.
 The following year he failed to qualify for the 1970 United States Grand Prix driving a works BRM, after an engine failure.
The 2013 German Grand Prix (formally known as the Formula 1 Großer Preis Santander von Deutschland 2013) was a Formula One motor race that was held on 7 July 2013 at the Nürburgring in Nürburg, Germany.
 The race was the ninth round of the 2013 season, and marked the 74th running of the German Grand Prix overall, and the 60th running of the German Grand Prix since 1950, when the racing series now known as the Formula One World Championship was created.
 This is the earliest a German Grand Prix has been held in a calendar year, followed by the 1926 and the 2009 editions of the race.
The 1959 German Grand Prix was a Formula One motor race held at the Automobil-Verkehrs- und Übungs-Straße in West Berlin on 2 August 1959.
 It was race 6 of 9 in the 1959 World Championship of Drivers and race 5 of 8 in the 1959 International Cup for Formula One Manufacturers.
 It was the 21st German Grand Prix and was only the second time the race was not held at the Nürburgring.
 AVUS had previously held the original German Grand Prix in 1926.
 The race was held over two 30 lap heats of the eight kilometre circuit for a total race distance of 498 kilometres.
The 1968 Grand Prix motorcycle racing season was the 20th F.I.M. Road Racing World Championship Grand Prix season.
 The season consisted of ten Grand Prix races in six classes: 500cc, 350cc, 250cc, 125cc, 50cc and Sidecars 500cc.
 It began on 21 April, with German Grand Prix and ended with Nations Grand Prix on 15 September.
 As the sidecar race was cancelled at the Nations Grand Prix, it was announced that a replacement race would be held at Hockenheimring in October alongside the German national championship.
John Malcolm Taylor (23 March 1933 – 8 September 1966) was a racing driver from England.
 He participated in five World Championship Formula One Grands Prix, and also participated in several non-championship Formula One races.
 His Formula One debut was on 11 July 1964, at the British Grand Prix at Brands Hatch driving a one-litre, 4-cylinder, Cooper–Ford T73, where he finished fourteenth, 24 laps down, after an extended pit–stop due to a gearbox problem.
 Taylor did not compete in the Formula One World Championship in 1965, but continued to drive in non–championship races.
 He returned to Grand Prix racing in 1966 driving a two-litre Brabham–BRM for privateer David Bridges.
 His first race that season was the French Grand Prix at Reims where he scored his one championship point.
 There followed eighth places at both the British Grand Prix at Brands Hatch and the Dutch Grand Prix at Zandvoort.
The Klenk-Meteor was a racing car which competed in the 1954 German Grand Prix.
 The car was based on the established German marque of Veritas which was active between 1948 and 1953.
 Veritas is chiefly remembered as a manufacturer of sports cars and successful Formula Two racing cars.
 The company closed when its founder, Ernst Loof, became ill.
 He subsequently died in 1956.
 The Klenk-Meteor entered for the 1954 German Grand Prix was essentially a Veritas Formula Two car.
 The car was owned and prepared by the noted German racing driver Hans Klenk who intended to race it himself in the Grand Prix.
 However, Klenk's career as a racing driver came to an end when he suffered injuries in an accident while working as a test driver for Mercedes-Benz.
 The car was driven in the Grand Prix by another German, Theo Helfrich.
 He retired on lap 9 with engine failure.
Christian Roger Xavier Marie Joseph Ghislain Goethals (4 August 1928 in Heule – 26 February 2003 in Kortrijk) was a racing driver from Belgium.
 Goethals competed as an amateur in sports car races, driving a Porsche Spyder during the 1950s.
 His best results were a second-place finish with his brother in the 1956 1500cc class event in Reims, and a win in the same class the following year at Forez.
 Goethals acquired a Cooper-Climax and entered it in the Formula Two class of the 1958 German Grand Prix, but retired from the race.
 He did not participate in another Formula One Grand Prix, and returned to sports cars, with notable finishes in 1960 of fifth in the Buenos Aires 1000 km and second in the GP de Spa.
 He retired from racing later in the season.
 He established a racing team called "Écurie Éperon d'Or" to participate in the 1958 German Grand Prix where he raced in a Cooper T43.
The 1974 German Grand Prix was a Formula One motor race held at the Nürburgring on 4 August 1974.
 It was race 11 of 15 in both the 1974 World Championship of Drivers and the 1974 International Cup for Formula One Manufacturers.
 It was the 36th German Grand Prix and the 33rd to be held at the Nürburgring complex of circuits.
 The race was won by Swiss driver Clay Regazzoni driving a Ferrari 312B3.
 Regazzoni led every lap on the way to his second Grand Prix victory, some four years after his debut victory at the 1970 Italian Grand Prix.
 South African driver Jody Scheckter was second driving a Tyrrell 007 ahead of Argentine driver Carlos Reutemann (Brabham BT44).