They had one child, a son Hermann. Karl, the younger of Planck's sons from his first marriage, was killed in 1916 during World War I. Both his daughters died in childbirth, Margarete in 1917 and Emma in 1919. His son Erwin became his best friend and advisor, but as we relate below Erwin died in even more terrible circumstances.
Sila ay may isang anak, isang anak na lalaki Hermann. Karl, ang mga bata ng Planck's anak mula sa kanyang unang kasal, ay namatay sa 1916 sa panahon ng World War I. Parehong kanyang anak namatay sa panganganak, Margarete sa 1917 at Emma sa 1919. Erwin kanyang anak na lalaki ay naging kanyang pinakamatalik na kaibigan at taga-payo, ngunit bilang namin kaugnay sa ibaba Erwin namatay sa mas marami pang kahila-hilakbot na mga pangyayari.