Prince Sigismund of Prussia, 2nd son of Irene and Heinrich. Sigismund did not have hemophilia, like his older and younger brothers. In 1927 Sigismund relocated his family to a banana and coffee plantation he owned in Costa Rica. He died there in 1978.
The family of Prince Henry (Heinrich) of Prussia (younger brother of Kaiser Wilhelm II) at Hemmelmark in 1927: Prince Sigismund, Princess Irene, Prince Heinrich holding Sigismund’s son Prince Alfred of Prussia; Alfred’s sister Princess Barbara in front of their mother, Princess Charlotte Agnes; Princess Calixta and her husband Prince Waldemar
Prince Henry and Princess Irene of Prussia with their three sons, Waldemar, Sigismund and infant Heinrich, who would die at age 4 from complications due to hemophilia. His older brother Waldemar also suffered from hemophilia.