Troelstralaan 50, Groningen Previous house Next house Residents in June 1941 Alexander Leefsma 1888 - 1942 Alma Leefsma-Salomon 1891 - 1942 Ernst Leefsma 1929 - 1942 Leo Joseph Leefsma 1920 - 1943 Child of Alexander Leefsma and his family date unknown