Claim: Hermann Minkowski (died January 12, 1909) had two daughters and one of his sons-in-law was Reinhold Rudenberg who patented carrier current communications
Evidence: Hermann Minkowski (/mɪŋˈkɔːfski, -ˈkɒf-/; German: [mɪŋˈkɔfski; 22 June 1864 – 12 January 1909) was a German mathematician of Polish-Jewish descent and professor at Königsberg, Zürich and Göttingen. He married Auguste Adler in 1897 with whom he had two daughters; the electrical engineer and inventor Reinhold Rudenberg was his son-in-law. Among his contributions were: Carrier current communications (patent)