Question: When is Prince Ernst August Of Hanover (Born 1983)'s mother's birthday?

Prince Ernst August of Hanover (born 1954)
Ernst August, Prince of Hanover( born 26 February 1954), is head of the royal House of Hanover which held the thrones of the United Kingdom until 1901, of the former Kingdom of Hanover until 1866, and of the sovereign Duchy of Brunswick from 1913 to 1918.
As the husband of Princess Caroline of Monaco, he is the brother- in- law of Albert II, Prince of Monaco.
Chantal Hochuli
Chantal Hochuli, formerly Chantal, Princess of Hanover, Duchess of Brunswick and Lüneburg (born 2 June 1955) is a Swiss socialite and heiress.
She is the ex-wife of Ernst August, Prince of Hanover, the head of the German House of Hanover.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
Ekaterina Malysheva
Ekaterina, Hereditary Princess of Hanover( née Malysheva; born 30 July 1986) is a Russian fashion designer and filmmaker.
She is the hereditary princess of the House of Hanover through her marriage to Ernst August, Hereditary Prince of Hanover.
Prince Christian of Hanover (born 1985)
Prince Christian of Hanover( Christian Heinrich Clemens Paul Frank Peter Welf Wilhelm- Ernst Friedrich Franz; born 1 June 1985) is a German noble, the younger son of Ernst August, Prince of Hanover, and his first wife, Chantal Hochuli.
He is second in the line of succession to the former Hanoverian throne, after his elder brother, Prince Ernst August.
As a descendant of Queen Victoria, through her daughter, Empress Frederick, Christian is also in the line of succession to the British throne.
Alexandra, Princess of Leiningen
Princess Alexandra of Hanover, Duchess of Brunswick- Lüneburg, Princess of Leiningen( born 18 February 1959), is the wife of Andreas, 8th Prince of Leiningen.
Born in Hanover, Lower Saxony, Germany, Alexandra is the youngest daughter of Ernest Augustus, Prince of Hanover( 1914 – 1987), and his wife, Princess Ortrud of Schleswig- Holstein- Sonderburg- Glücksburg( 1925–1980).
Her eldest brother is Ernst August, Prince of Hanover, current head of the House of Hanover and her sister- in- law is Princess Caroline of Monaco.
Prince Ernst August of Hanover (born 1983)
Ernst August, Hereditary Prince of Hanover (born 19 July 1983) is the eldest child of Ernst August, Prince of Hanover (head of the ancient House of Welf which once ruled the Kingdom of Hanover), and his former wife Chantal Hochuli.
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 Ernest Augustus, 3rd Duke of Cumberland and Teviotdale
Ernest Augustus, Crown Prince of Hanover, 3rd Duke of Cumberland and Teviotdale( 21 September 1845 – 14 November 1923), was the eldest child and only son of George V of Hanover and his wife, Marie of Saxe- Altenburg.
Ernst August was deprived of the thrones of Hanover upon its annexation by Prussia in 1866 and later the Duchy of Brunswick in 1884.
Although he was the senior male- line great- grandson of George III, the Duke of Cumberland was deprived of his British peerages and honours for having sided with Germany in World War I. Ernst August was the last Hanoverian prince to hold a British royal title and the Order of the Garter.
His descendants are in the line of succession to the British throne.
Princess Alexandra of Hanover (born 1999)
Princess Alexandra of Hanover( Alexandra Charlotte Ulrike Maryam Virginia; born 20 July 1999) is the only child of Princess Caroline of Monaco and Prince Ernst August of the defunct Kingdom of Hanover.

Answer: 2 June 1955