Question: What is the date of birth of Prince Bernhard Of Orange-Nassau, Van Vollenhoven's father?

Knowledge 1: Prince Bernhard of Orange-Nassau, van Vollenhoven
Prince Bernhard Lucas Emmanuel of Orange-Nassau, van Vollenhoven (born 25 December 1969) is the second son of Princess Margriet of the Netherlands and Pieter van Vollenhoven.Before the succession of his cousin Willem-Alexander as King, he was a member of the Dutch Royal House and eleventh in the line of succession to the Dutch throne.With Willem-Alexander's succession however, he is no longer a member of the Dutch Royal House, and is no longer in line to direct succession to the Dutch throne, but still retains its membership as a member of the Dutch Royal Family [SEP] Knowledge 2: Pieter van Vollenhoven
Pieter van Vollenhoven Jr. (born April 30, 1939) is the husband of Princess Margriet of the Netherlands and a member, by marriage, of the Dutch Royal House.
Knowledge 1: Prince Bernhard of Orange-Nassau, van Vollenhoven
Prince Bernhard Lucas Emmanuel of Orange-Nassau, van Vollenhoven (born 25 December 1969) is the second son of Princess Margriet of the Netherlands and Pieter van Vollenhoven.Before the succession of his cousin Willem-Alexander as King, he was a member of the Dutch Royal House and eleventh in the line of succession to the Dutch throne.With Willem-Alexander's succession however, he is no longer a member of the Dutch Royal House, and is no longer in line to direct succession to the Dutch throne, but still retains its membership as a member of the Dutch Royal Family [SEP] Knowledge 2: Prince Pieter-Christiaan of Orange-Nassau, van Vollenhoven
Prince Pieter-Christiaan Michiel of Orange-Nassau, van Vollenhoven (born 22 March 1972), is the third son of Princess Margriet of the Netherlands and Prof. Pieter van Vollenhoven.Before the succession of his cousin Prince Willem-Alexander as King, he was a member of the Dutch Royal House and twelfth in line to the throne.With Willem-Alexander's succession however, he is no longer a member of the Dutch Royal House, and is no longer in line to direct succession to the Dutch throne, but still retains his membership as a member of the Dutch Royal Family
Knowledge 1: Prince Bernhard of Orange-Nassau, van Vollenhoven
Prince Bernhard Lucas Emmanuel of Orange-Nassau, van Vollenhoven (born 25 December 1969) is the second son of Princess Margriet of the Netherlands and Pieter van Vollenhoven.Before the succession of his cousin Willem-Alexander as King, he was a member of the Dutch Royal House and eleventh in the line of succession to the Dutch throne.With Willem-Alexander's succession however, he is no longer a member of the Dutch Royal House, and is no longer in line to direct succession to the Dutch throne, but still retains its membership as a member of the Dutch Royal Family [SEP] Knowledge 2: Prince Bernhard of Lippe (1872–1934)
Prince Bernhard of Lippe (Bernhard Kasimir Wilhelm Friedrich Gustav Heinrich Eduard; Oberkassel, 26 August 1872 – Munich, 19 June 1934) was a member of the Lippe-Biesterfeld line of the House of Lippe.He is most notable for being the father of Prince Bernhard of Lippe-Biesterfeld, the prince consort of Queen Juliana of the Netherlands.

Answer: April 30, 1939