BERLIN, May 21 (UPI) -- The descendants of German composer Richard Wagner said they are releasing letters that could shed light on the family's connection to the Nazi regime.
The composer's great-granddaughter Katharina Wagner has promised the "prompt" release of family letters, coinciding with the musician's 200th birthday Wednesday, Tribune Newspapers reported Tuesday.
The contents of the letters are unknown, but researchers said they could reveal to what extent the Wagners colluded with the Nazis.
The letters belonged to Wolfgang Wagner, Katharina's father, who was a member of the Hitler Youth and who later ran the Bayreuth Festival dedicated to his composer grandfather, the newspaper group said.
Wolfgang's British-born mother, Winifred, was reportedly a friend of Adolf Hitler's, and correspondence between the two is held by another family member, who has not agreed to release the letters.
Katharina told Berlin newspaper Der Tagesspiegel she rarely spoke with her father about the family's alleged Nazi collusion.
"I only knew that my father did not approve of his mother's entanglements. I noticed that it weighed heavily on him emotionally and so I did not pester him," she said.
Katharina said the letters would be handed over to the Bavarian state archive.