Hans Waldemar Ruin (18 June 1891 – 3 November 1980) was a Finnish philosopher and writer of Swedish-Finnish extraction. Biography. Ruin was the son of Professor Waldemar Ruin and Flora Lindholm. He married Karin "Kaisi" Sievers (1894) in 1917, daughter of physician Klas Richard Sievers and Freifrau Karin von Bonsdorff. He had two children, Martina and Olof, and maternal grandfather to David and Marika Lagercrantz. His grandchild was also named Hans Ruin and became a philosopher.
https://en.wikipedia.org/wiki/Hans_Ruin
Hans Waldemar Ruin (18 June 1891 – 3 November 1980) was a Finnish philosopher and writer of Swedish-Finnish extraction. Biography. Ruin was the son of Professor Waldemar Ruin and Flora Lindholm. He married Karin "Kaisi" Sievers (1894) in 1917, daughter of physician Klas Richard Sievers and Freifrau Karin von Bonsdorff. He had two children, Martina and Olof, and maternal grandfather to David and Marika Lagercrantz. His grandchild was also named Hans Ruin and became a philosopher.
