also lost another one of her daughters-in-law during the war. Wolfgang's wife, Princess Marie Alexandra, when she and seven other women who were aid workers were killed in a bomb attack on Frankfurt on 29–30 January 1944. The cellar in which they had taken refuge collapsed under the weight of the building, rendering Marie Alexandra's body barely recognisable. Landgravine Margaret, very much the matriarch, was at the centre of her large and dynamic family. During and after World War II, she took care of many of her grandchildren and tried to preserve a centre at Friedrichshof as their parents faced various tribulations. Last years Landgravine Margaret had difficult years after 1945; they were compounded by the theft from Schloss Friedrichshof in November 1945 of the family jewellery, valued at over £2,000,000. After World War II, Friedrichshof was used as an officer's club by the military authorities during the American occupation. Princess Margaret's son Wolfgang, fearing for the jewels, had buried them in a sub-cellar of the castle. On 5 November 1945, the manager of the club, Captain Kathleen Nash, discovered the jewels and together with her future husband, Colonel Jack Durant, and Major David Watson, stole the treasure and took it out of Germany. In early 1946, Princess Margaret discovered the theft when the family wanted to use the jewels for the wedding of Princess Sophia who was preparing to remarry. Princess Sophia and Landgravine Margaret reported it to the Frankfurt authorities, and the culprits were imprisoned in August 1951. The Hesse family received what had been recovered: only 10 percent of what had been stolen. Landgravine Margaret, the last surviving child of Emperor Frederick III and last grandchild of emperor Emperor Wilhelm I, died in Kronberg on 22 January 1954, 14 years after her husband and exactly 53 years to the day after her British grandmother Queen Victoria. She was 81 years old. Children Landgravine Margaret and her husband Frederick Charles of Hesse had six sons, including two sets of twins: Prince Friedrich Wilhelm of Hesse-Kassel (24 November 1893 – 12 September 1916), killed in action in World War I. Prince Maximilian of Hesse-Kassel (20 October 1894 – 13 October 1914), killed in action in World War I. Prince Philipp of Hesse-Kassel (6 November 1896 – 25 October 1980 Rome), married on 23 September 1925 to Princess Mafalda of Savoy (19 November 1902 Rome – 28 August 1944), had