Prince Henry of Prussia (1900–1904)
Prince Heinrich of Prussia,( 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, and thus a grandson of Frederick III, German Emperor on his father's side and a great- grandson of Queen Victoria through both his mother and father.
He died aged four.
Prince Heinrich I Reuss of Köstritz
Prince Heinrich I Reuss of Köstritz( 8 October 191010 March 1982) was son of Prince Heinrich XXXIV Reuss of Köstritz and member of the House of Reuss.
Prince Heinrich XXXIII Reuss of Köstritz
Prince Heinrich XXXIII Reuss of Köstritz (26 July 1879 – 15 November 1942) was the son of Prince Heinrich VII Reuss of Köstritz and his wife Princess Marie Alexandrine of Saxe-Weimar-Eisenach.
Thyra von Westernhagen
Thyra, Princess Heinrich of Hanover( née Thyra von Westernhagen; born 14 August 1973) is a German forester and landowner.
As the wife of Prince Heinrich of Hanover, she is a princess of the House of Hanover.
Prince Heinrich VIII Reuss of Köstritz
Prince Heinrich VIII Reuss of Köstritz( born 30 August 1944) is a son of Prince Heinrich I Reuss of Köstritz, and is a member of the House of Reuss.
Princess Maria Elisabeth of Bavaria
Princess Maria Elisabeth of Bavaria( 9 September 1914 – 13 May 2011) was the eldest daughter of Prince Franz of Bavaria, third son of Ludwig III of Bavaria.
Prince Heinrich of Bavaria
Prince Heinrich of Bavaria (24 June 1884 – 8 November 1916) was a member of the Bavarian Royal House of Wittelsbach and a highly decorated Army officer in the First World War.
Prince Heinrich of Bavaria (1922–1958)
Prince Heinrich of Bavaria  (28 March 1922 – 14 February 1958) was a member of the Bavarian royal House of Wittelsbach.
Prince Heinrich was born at Schloss Hohenburg in Bavaria and was the eldest son from the marriage of Crown Prince Rupprecht of Bavaria and his second wife, Princess Antonia of Luxembourg.
On 31 July 1951, Prince Heinrich married Anne Marie de Lustrac (27 September 1927 in Neuilly-sur-Seine – 16 August 1999 in Milan), daughter of Baron Jean de Lustrac, French Army officer and decorated World War
I veteran, and his wife, Helen Reid, daughter of Fergus Reid of Norfolk, Virginia.
The ceremony took place in Saint-Jean-de-Luz on the Basque coast in France.
The couple did not have any children together.
The prince was a Knight of the Order of Saint Hubert.
He died in a car accident in San Carlos de Bariloche, Argentina in the Andes on 14 February 1958.
He is buried at the Andechs Abbey church in Bavaria.
Prince Heinrich's widow, Anne Marie de Lustrac, died also in a car crash in Milan, Italy on 16 August 1999.
Rupprecht, Crown Prince of Bavaria
Rupprecht, Crown Prince of Bavaria, Duke of Bavaria, Franconia and in Swabia, Count Palatine by (the) Rhine ("Rupprecht Maria Luitpold Ferdinand";
English: "Robert Maria Leopold Ferdinand"; 18 May 1869 – 2 August 1955) was the last heir apparent to the Bavarian throne.
During the first half of the First World War he commanded the 6th Army on the Western Front.
From August 1916, he commanded Army Group Rupprecht of Bavaria, which occupied the sector of the front opposite the British Expeditionary Force.
Prince Heinrich of Hanover
Prince Heinrich of Hanover( Heinrich Julius Christian Otto Friedrich Franz Anton Günter; born 29 April 1961) is a historian and publisher in Göttingen with publishing firm MatrixMedia.

Question: When is Prince Heinrich Of Bavaria (1922–1958)'s father's birthday?
Answer: 18 May 1869