I posted this a couple of days ago; perhaps you missed it; it's on the thread about Heydrich's alleged Jewish ancestry:
"I personally knew Heydrich's nephew, Heider Heydrich of Koeln. I met Heider Heydrich when he lived in the US from about 1985-95. His father (Reinhard Heydrich's only brother) was an officer in an infantry regiment and was allegedly KIA in the East shortly following the assassination of his brother. The nephew informed me that his father had actually committed suicide at the insistence of higher authority (something about "lines of succession"). At any rate, Heider Heydrich (who passed away in 1995 and who by the way was a "dead ringer" for his uncle, looks-wise) once told me that the family had a "standing joke" relating to the "Jewish ancestry" of his younger brother, who dark-complexioned with a full head of very curly, dark hair. Of course, this was simply a family joke; Heider Heydrich admitted of NO Jewish ancestry in his family."
Now, this is the story that was given to me, "straight from the horse's mouth", so to speak. However, it is possible that Reinhard Heydrich's brother was a myth invented to protect one of his sons. I can accept that, if it's the truth. Heider Heydrich left Europe and moved to the U.S. because, in part, of adverse publicity; he arrived in Denver, Colorado ca. 1985 and straightaway I walked into the sandwich shop he was running, struck up a conversation and immediately asked "the question" about his surname! You can well imagine how "floored" he was. After he related the story of his family to me, I told him I would never reveal "who" he was to anyone while he lived in the States. Heider Heydrich passed away in 1995 at the age of 58; he'd told me he was eight years old in 1945. Heider Heydrich was the antithesis of his "uncle"; he was unassuming and humorous as opposed to arrogant and ruthless. Regardless of his parentage, I called him a friend.