He had already suffered the loss of two infant sons, but even more devastating was the loss of his remaining two sons, one of whom died in 1910 while working for his habilitation on a topic on the history of music, the other became ill in an army camp and died briefly before end of World War I in 1918.
Niya na suffered ang pagkawala ng dalawang sanggol anak, ngunit mas nagwawasak ay ang pagkawala ng kanyang natitirang dalawang anak, isa sa kanino namatay sa 1910 habang nagtatrabaho para sa kanyang habilitation sa isang paksa sa kasaysayan ng musika, ang iba pang naging masama sa isang kampo ng hukbo at namatay dagli bago katapusan ng World War I in 1918.