Question: Which distant cousin of a German field marshal of the "Luftwaffe" was a German First World War fighter ace credited with 40 victories?

Context paragraphs:
Julius Buckler: Julius Buckler (28 March 1894 Mainz-Mombach – 23 May 1960 Bonn) was a German First World War fighter ace credited with 36 victories during the war.  He shot down 29 enemy airplanes and 7 balloons; two other victories went unconfirmed.  He was one of only four German fighter aces to win Germany's highest decorations for valor for both enlisted man and officer.

List of World War II aces from Germany: This is a list of fighter aces in World War II from Germany.  A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat.  German day and night fighter pilots claimed roughly 70,000 aerial victories during World War II, 25,000 over British or American and 45,000 over Russian flown aircraft.  103 German fighter pilots shot down more than 100 enemy aircraft for a total of roughly 15,400 aerial victories.  Roughly a further 360 pilots claimed between 40 and 100 aerial victories for round about 21,000 victories.  Another 500 fighter pilots claimed between 20 and 40 victories for a total of 15,000 victories.  It is relatively certain that 2,500 German fighter pilots attained ace status, having achieved at least 5 aerial victories.  These achievements were honored with 453 German day and "Zerstörer" (destroyer) pilots having received the Knight's Cross of the Iron Cross.  85 night fighter pilots, including 14 crew members, were awarded the Knight's Cross of the Iron Cross.

Kurt Welter: Kurt Welter (25 February 1916 – 7 March 1949) was a German "Luftwaffe" fighter ace and the most successful "Jet Expert" of World War II.  A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat.  He claimed a total of 63 aerial victories—that is, 63 aerial combat encounters resulting in the destruction of the enemy aircraft—achieved in 93 combat missions.  He recorded 56 victories at night, including 33 Mosquitos, and scored more aerial victories from a jet fighter aircraft than anyone else in World War II and possibly in aviation history.  However this score is a matter of controversy; research of Royal Air Force losses suggests Welter overclaimed Mosquito victories considerably.

Lothar von Richthofen: Lothar Freiherr von Richthofen (born Lothar Siegfried Freiherr von Richthofen; 27 September 1894 – 4 July 1922) was a German First World War fighter ace credited with 40 victories.  He was a younger brother of top-scoring ace Manfred von Richthofen (the "Red Baron") and a distant cousin of Luftwaffe Field Marshal Wolfram von Richthofen.

Hans Beißwenger: Hans Beißwenger (8 November 1916 – 6 March 1943) was a German Luftwaffe fighter ace and recipient of the Knight's Cross of the Iron Cross with Oak Leaves during World War II.  A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat.  In 500 combat missions, Beißwenger was credited with 152 victories, making him the 34th highest-scoring Luftwaffe fighter pilot of World War II.  He was "ace-in-a-day" twice, shooting down five aircraft on a single day.  He claimed all but one of his victories over the Eastern Front.  He was reported missing in action in March 1943.

Carl Menckhoff: Carl Menckhoff (14 April 1883 – 11 January 1949) was a German First World War fighter ace, credited with 39 confirmed victories.  Already in his 30s when he learned to fly, he was one of the oldest pilots in the Imperial German Air Service.  He transferred from infantry service to aviation as a non-commissioned officer, but afterwards succeeded in being commissioned as an officer.  He won the Pour le Mérite ("Blue Max"), and was given a squadron command.

Heinrich Gontermann: Heinrich Gontermann (25 February 1896 – 30 October 1917) was a German First World War fighter ace credited with 39 victories during the war.

Hubertus von Bonin: Hubertus von Bonin (born 3 August 1911, Potsdam – 15 December 1943) was a German Second World War fighter ace who served in the "Luftwaffe".  A flying or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat.  Bonin is credited with shooting down 77 enemy aircraft.  The majority of his victories were claimed over the Eastern Front.  He also claimed four victories in Spain during the civil war.  His commands included "Geschwaderkommodore" of Jagdgeschwader 54 (JG 54—54th Fighter Wing).

List of German World War II night fighter aces: A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat.  German day and night fighter pilots claimed roughly 70,000 aerial victories during World War II, 25,000 over British or American and 45,000 over Soviet flown aircraft.  103 German fighter pilots shot down more than 100 enemy aircraft for a total of roughly 15,400 aerial victories.  Roughly a further 360 pilots claimed between 40 and 100 aerial victories for round about 21,000 victories.  Another 500 fighter pilots claimed between 20 and 40 victories for a total of 15,000 victories.  According to Obermeier, it is relatively certain, that 2,500 German fighter pilots attained ace status, having achieved at least 5 aerial victories.  453 German day and "Zerstörer" (destroyer) pilots received the Knight's Cross of the Iron Cross.  85 night fighter pilots, including 14 crew members, were awarded the Knight's Cross of the Iron Cross.  The list is sorted by the number of aerial victories claimed at night.

Wolfram Freiherr von Richthofen: Wolfram Freiherr von Richthofen (10 October 1895 – 12 July 1945) was a German field marshal of the "Luftwaffe" (German Air Force) during the World War II.  Born in 1895 into a family of the Prussian nobility, Richthofen grew up in prosperous surroundings.  At the age of eighteen, after leaving school, he opted to join the German Army rather than choose an academic career, and joined the army's cavalry arm in 1913.

Supporting paragraphs: Lothar von Richthofen Wolfram Freiherr von Richthofen
Answer: Lothar Freiherr von Richthofen