Prince Valdemar 
of Prussia

1889 - 1945

Prince Sigismund
of Prussia

1896 - 1978

Prince Heinrich 

of Prussia

1900 - 1904

Waldemar Wilhelm Ludwig Friedrich Viktor Heinrich) (20 March 1889 at Kiel – 2 May 1945 at Tutzing, Bavaria) was the eldest son of Prince Henry of Prussia and his wife, Princess Irene of Hesse and by Rhine. No issue.

Wilhelm Viktor Karl August Heinrich Sigismund; 27 November 1896 at Kiel – 14 November 1978 at Puntarenas, Costa Rica), was the second son of Prince Henry of Prussia and his wife, Princess Irene of Hesse and by Rhine

Prince Heinrich of Prussia, (German: Heinrich Viktor Ludwig Friedrich; 9 January 1900 – 26 February 1904), was the haemophiliac third son and youngest child of Prince Henry of Prussia and Princess Irene of Hesse and by Rhine