Martin Heidegger spouse Elfride Heidegger
Personal life
Heidegger married Elfride Petri on 21 March 1917, in a Catholic ceremony officiated by his friend Engelbert Krebs, and a week later in a Protestant ceremony in the presence of her parents. Their first son, Jörg, was born in 1919.: 159  Elfride then gave birth to Hermann in August 1920. Heidegger knew that he was not Hermann's biological father but raised him as his son. Hermann's biological father, who became godfather to his son, was family friend and doctor Friedel Caesar. Hermann was told of this at the age of 14; Hermann became a historian and would later serve as the executor of Heidegger's will. Hermann Heidegger died on 13 January 2020.Heidegger spent much time at his vacation home at Todtnauberg, on the edge of the Black Forest. He considered the seclusion provided by the forest to be the best environment in which to engage in philosophical thought.Affairs
Heidegger had a four-year affair with Hannah Arendt and a decades-long affair with Elisabeth Blochmann; both women were his students. Arendt was Jewish, and Blochmann had one Jewish parent, making them subject to severe persecution by the Nazi authorities. 
The 35-year-old Heidegger, who was married with two young sons, began a long romantic relationship with 17-year-old Arendt  who later faced criticism for this because of Heidegger's support for the Nazi Party after his election as rector at the University of Freiburg in 1933. They agreed to keep the details of the relationship a secret, preserving their letters but keeping them unavailable. The relationship was not known until Elisabeth Young-Bruehl's biography of Arendt appeared in 1982. At the time of publishing, Arendt and Heidegger were deceased and Heidegger's wife, Elfride (1893–1992), was still alive. The affair was not widely known until 1995, when Elzbieta Ettinger gained access to the sealed correspondence.It is probably fair to say that, following his relationship with Hannah Arendt, Blochmann had one of the most important extramarital affairs with Heidegger (as is known since 2005, Heidegger led something of an open marriage and his wife Elfriede both knew about his affairs and conducted her own). Elfriede Heidegger and Elisabeth Blochmann were friends and former classmates. The story is well documented in the 1989 edition of their letters, starting in 1918. Heidegger's letters to his wife contain information about several other affairs of his. He helped Blochmann emigrate from Germany before the start of World War II and resumed contact with both of them after the war.
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