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.
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 had a long romantic relationship with Hannah Arendt and an affair (over many decades) with Elisabeth Blochmann, both students of his.
Arendt was Jewish, and Blochmann had one Jewish parent, making them subject to severe persecution by the Nazi authorities.
He helped Blochmann emigrate from Germany before the start of World War II and resumed contact with both of them after the war.
Heidegger's letters to his wife contain information about several other affairs of his.

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.

A few months before his death, he met with Bernhard Welte, a Catholic priest, Freiburg University professor and earlier correspondent.
The exact nature of their conversation is not known, but what is known is that it included talk of Heidegger's relationship to the Catholic Church and subsequent Christian burial at which the priest officiated.
Heidegger died on 26 May 1976, and was buried in the Meßkirch cemetery.
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. 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 had a long romantic relationship with Hannah Arendt and an affair (over many decades) with Elisabeth Blochmann, both students of his. Arendt was Jewish, and Blochmann had one Jewish parent, making them subject to severe persecution by the Nazi authorities. He helped Blochmann emigrate from Germany before the start of World War II and resumed contact with both of them after the war. Heidegger's letters to his wife contain information about several other affairs of his.
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.
A few months before his death, he met with Bernhard Welte, a Catholic priest, Freiburg University professor and earlier correspondent. The exact nature of their conversation is not known, but what is known is that it included talk of Heidegger's relationship to the Catholic Church and subsequent Christian burial at which the priest officiated. Heidegger died on 26 May 1976, and was buried in the Meßkirch cemetery.
Martin Heidegger