Question: Whose father adopted the policy of Blood and Iron?

full_context: Document 1: Bismarck Mausoleum: The Bismarck Mausoleum is the mausoleum of Prince Otto von Bismarck and his wife Johanna von Puttkamer. It is on the Schneckenberg hill just outside Friedrichsruh in northern Germany. Bismarck was the first Chancellor of Germany (1871–1890). The chapel is now a protected monument.
Document 2: John von Berenberg-Gossler: John von Berenberg-Gossler (22 October 1866 in Hamburg – 14 July 1943) was a Hamburg banker, politician and grand burgher. He was elected Senator in Hamburg in 1908 and served as German Ambassador to Italy 1920–21. He was a member of the Berenberg-Gossler banking dynasty and the son of Baron Johann von Berenberg-Gossler (1839–1913), owner of Berenberg Bank, who was ennobled in Prussia in 1888 and conferred Baronial rank in 1910. His father had destined him to succeed him as head of the bank, and his election as Senator took place against the will of his father. He was forced to sell his share of the bank, and his brother Cornelius Freiherr von Berenberg-Gossler succeeded their father as head of the bank. He was head of the bank "Hamburger Bank von 1923" from 1923 to 1925.
Document 3: Wilhelm von Bismarck: Count Wilhelm von Bismarck-Schönhausen (né "Wilhelm Otto Albrecht von Bismarck") (1 August 1852 – 30 May 1901) was a German counselor, civil servant and politician, who served as a member of the Reichstag from 1880 to 1881 and president of the Regency of Hanover from 1889 to 1890. The youngest son of Otto von Bismarck, he and his brother Herbert von Bismarck both resigned their posts after the elder Bismarck was dismissed as Chancellor of Germany in 1890. Wilhelm subsequently accepted an appointment as Governor of East Prussia in 1894.
Document 4: Heinrich Mann: Born in Lübeck, as the oldest child of Senator Thomas Johann Heinrich Mann, grain merchant and finance minister of the Free City of Lübeck, a state of the German Empire, and Júlia da Silva Bruhns. He was the elder brother of novelist Thomas Mann. The Mann family was an affluent family of grain merchants of the Hanseatic city of Lübeck. After the death of his father, his mother relocated the family to Munich, where Heinrich began his career as a "freier Schriftsteller" (free novelist).
Document 5: William I, German Emperor: William I, ( ; 22 March 1797 – 9 March 1888) of the House of Hohenzollern, was King of Prussia from 2 January 1861 and the first German Emperor from 18 January 1871 to his death, the first Head of State of a united Germany. Under the leadership of William and his Minister President Otto von Bismarck, Prussia achieved the unification of Germany and the establishment of the German Empire. Despite his long support of Bismarck as Minister President, William held strong reservations about some of Bismarck's more reactionary policies, including his anti-Catholicism and tough handling of subordinates. In contrast to the domineering Bismarck, William was described as polite, gentlemanly and, while staunchly conservative, more open to certain classical liberal ideas than his grandson Wilhelm II.
Document 6: Blood and Iron (speech): Blood and Iron (German: Blut und Eisen) is the name given to a speech made by Otto von Bismarck given on 30 September 1862, at the time when he was Minister President of Prussia, about the unification of the German territories. It is also a transposed phrase that Bismarck uttered near the end of the speech that has become one of his most widely known quotations.
Document 7: Unification of Germany: The unification of Germany into a politically and administratively integrated nation state officially occurred on 18 January 1871, in the Hall of Mirrors at the Palace of Versailles in France. Princes of the German states, excluding Austria, gathered there to proclaim Wilhelm I of Prussia as German Emperor after the French capitulation in the Franco - Prussian War. Unofficially, the de facto transition of most of the German - speaking populations into a federated organization of states had been developing for some time through alliances formal and informal between princely rulers -- but in fits and starts; self - interests of the various parties hampered the process over nearly a century of autocratic experimentation, beginning in the era of the Napoleonic Wars, which saw the dissolution of the Holy Roman Empire of the German Nation (1806), and the subsequent rise of German nationalism.
Document 8: Bismarck Monument (Bad Kissingen): The Bismarck Monument in Bad Kissingen is located in Hausen (a quarter of the German spa town, Bad Kissingen), which Chancellor Otto von Bismarck visited 14 times to "take the cure" between 1876 and 1893. The monument was built in 1877, during his lifetime. It was the first statue to be erected in Bismarck's honour.
Document 9: Otto Christian Archibald von Bismarck: He was the eldest of the three sons of Herbert von Bismarck, as well as the grandson of the German chancellor Otto von Bismarck and elder brother of Gottfried Graf von Bismarck-Schönhausen. A lawyer, he became the owner of the family estate in Schönhausen and joined the diplomatic service in 1927, serving in Stockholm (1927–28), London (1928–37), with the Foreign Ministry in Berlin (1937–40), as Envoy to Rome (Kingdom of Italy) (1940–43), and finally as head of the Italian section of the Foreign Ministry (1943–44).
Document 10: Bismarck monument: From 1868 onwards, Bismarck monuments were erected in many parts of the German Empire in honour of the long-serving Prussian minister-president and first German "Reichskanzler", Prince Otto von Bismarck. Today some of these monuments are on the soil of other countries including France, Poland and Russia as well as the former German colonies on other continents.
Document 11: Blood and Iron (speech): Blood and Iron (German: Blut und Eisen) is the title of a speech by Minister President of Prussia Otto von Bismarck given in 1862 about the unification of the German territories. It is also a transposed phrase that Bismarck uttered near the end of the speech that has become one of his most widely known quotations.
Document 12: Unification of Germany: Historians debate whether Otto von Bismarck -- Minister President of Prussia -- had a master plan to expand the North German Confederation of 1866 to include the remaining independent German states into a single entity or simply to expand the power of the Kingdom of Prussia. They conclude that factors in addition to the strength of Bismarck's Realpolitik led a collection of early modern polities to reorganize political, economic, military, and diplomatic relationships in the 19th century. Reaction to Danish and French nationalism provided foci for expressions of German unity. Military successes -- especially those of Prussia -- in three regional wars generated enthusiasm and pride that politicians could harness to promote unification. This experience echoed the memory of mutual accomplishment in the Napoleonic Wars, particularly in the War of Liberation of 1813 -- 14. By establishing a Germany without Austria, the political and administrative unification in 1871 at least temporarily solved the problem of dualism.
Document 13: Baron Heinrich Karl von Haymerle: Baron Heinrich Karl von Haymerle (7 December 1828 – 10 October 1881) was an Austrian statesman born and educated in Vienna. He took part in the students' uprising in the revolution of 1848 and narrowly escaped execution. He served in the diplomatic corps at Athens, Dresden, and Frankfurt as Secretary of Legation; and served as ambassador in Copenhagen (1864), took part in negotiating the Treaty of Prague (1866), and from Berlin went to Constantinople (1868), Athens (1869), The Hague (1872), and in 1877 to the Italian court. He represented Austria-Hungary at the Congress of Berlin in 1878 and served as foreign minister from 1879 to 1881. In this post he was especially active in effecting friendly relations with Italy and cementing the alliance with Germany.
Document 14: Territorial evolution of Germany: The territorial changes of Germany include all changes in the borders and territory of Germany from its formation in 1871 to the present. Modern Germany was formed in 1871 when Otto von Bismarck unified most of the German states, with the notable exception of Austria, into the German Empire. After the First World War, Germany lost about 10% of its territory to its neighbours and the Weimar Republic was formed. This republic included territories to the east of today's German borders.
Document 15: Herbert von Bismarck: Prince Nikolaus Heinrich Ferdinand Herbert von Bismarck (Born Nikolaus Heinrich Ferdinand Herbert von Bismarck-Schönhausen; 28 December 1849 – 18 September 1904) was a German politician, who served as Foreign Secretary from 1886 to 1890. His political career was closely tied to that of his father, Otto von Bismarck, and he left office a few days after his father's dismissal. He succeeded his father as the 2nd Prince of Bismarck in 1898. He was born in Berlin and died in Friedrichsruh.
ground_truth: Herbert von Bismarck
sub_queries: who adopted the policy of blood and iron Answer: Otto von Bismarck
Otto von Bismarck >> child Answer: Herbert von Bismarck