Information: Wikipedia

A Stolperstein literally "stumbling stone", metaphorically a "stumbling block" is a sett-size, 10 by 10 centimetres (3.9 in × 3.9 in) concrete cube bearing a brass plate inscribed with the name and life dates of victims of Nazi extermination or persecution.

The Stolpersteine project, initiated by the German artist Gunter Demnig in 1992, aims to commemorate individuals at exactly the last place of residency—or, sometimes, work—which was freely chosen by the person before he or she fell victim to Nazi terror, euthanasia, eugenics, was deported to a concentration or extermination camp, or escaped persecution by emigration or suicide. As of 29 March 2018, over 67,000 Stolpersteine have been laid in 22 countries, making the Stolpersteine project the world's largest decentralized memorial.

The majority of Stolpersteine commemorate Jewish victims of the Holocaust. Others have been placed for Sinti and Romani people (then also called "gypsies"), homosexuals, the physically or mentally disabled, Jehovah's Witnesses, black people, members of the Communist Party, the Social Democratic Party, and the anti-Nazi Resistance, the Christian opposition (both Protestants and Catholics), and Freemasons, along with International Brigade soldiers in the Spanish Civil War, military deserters, conscientious objectors, escape helpers, capitulators, "habitual criminals", looters, and others charged with treason, military disobedience, or undermining the Nazi military, as well as Allied soldiers.

Julius Joseph, who came from Hessen, lived with his wife Hertha and his little son Marcel in what is now Kirchbuschweg, where he ran a farm. Later he also took in his in-laws from Rheinland-Pfalz, who, like him and his wife, had fled from the Nazis.

Julius Joseph was arrested on May 1, 1941, first taken to a labor camp in Stolberg and then deported to Auschwitz. He was murdered there on July 16, 1942. In the same year his wife, who was expecting a second child, and his son were arrested. Their trail is lost.

Franz Kockartz was a postman and he delivered the draft orders for the young soldiers. He warned the families in advance. Then he was betrayed, picked up and never came back. After being sent to a labor camp in Aachen, Franz Kockartz was deported to Neuengamme concentration camp. The father of four children was murdered there on June 5, 1942.