The historical record does not support the claim that Wilhelm II had a “sixth son” who died by suicide. He had one son, Crown Prince Wilhelm, and several daughters, so the premise appears to be mistaken.
What is well documented is that Wilhelm II was often described as harsh, emotionally distant, and a difficult father, but I could not verify a reliable source about a specific son’s suicide reaction from the material available here.
What can be said safely
- Wilhelm II had one son and multiple daughters, not six sons.
- Claims about a dramatic reaction to a son’s suicide appear to come from sensational or low-reliability secondary sources rather than solid historical documentation.
Context
If you meant his youngest son’s death after a breakdown , some modern posts discuss that story, but the wording is often exaggerated and not well sourced.
Bottom line
Based on the available reliable information, there is no verified account that Wilhelm II reacted to a “sixth son’s suicide,” because he did not have six sons.
TL;DR: The premise is incorrect; Wilhelm II had one son, and I couldn’t verify any trustworthy source for the suicide story.