Anton and Johann Dierle
Neal O'Connor's "Aviation Awards of Imperial Grmany" Vol. VI contains the history of Offizier-Stellvertreters Anton and Johann Dierle, twins from Baden whose careers paralleled each other's remarkably. They entered the army together, transferred to the Fliegertruppe simultaneously, and both were posted to Kampfstaffel 11 of Kampgfgeschwader 2.They were both given the Silver Karl Friedrich Military Merit Medal on 8 December 1916. Anton then joined Jasta 24 as a fighter pilot on 21 December, followed by Johann on 17 February 1917. Anton scored his first victory on 9 March '17. On 4 May , Anton and Johann both engaged 4 Caudrons escorted by a Nieuport. Though one of the Caudrons was observed to go into a long glide, neither brother received confirmation of a victory. The very next day-5 May -Anton's Albatros D.III was set aflame during a combat, and he either jumped or fell out of the burning aircraft at 200 meters and died. On 1 July Johann (who had been unable to score a single victory) was transferred to Fl. Abt. 7, then went on to Kest 4b as a home defense fighter pilot. On 29 July 1918, he attacked some French planes that were returning from a raid on Oberndorf and he, too, died when his plane fell in flames.
You can find much more, as well as photos, in Neal's book.