Question: Who is the sibling of the person who created The Double Dream of Spring?

full_context: Document 1: The Melancholy of Departure: The Melancholy of Departure (1916) is a painting by the Greek-Italian metaphysical painter Giorgio de Chirico. This painting was created after de Chirico returned to Italy from Paris to join the Italian Army in World War I.
Document 2: Dante's Dream: Dante's Dream (full title Dante's Dream at the Time of the Death of Beatrice) is a painting from 1871 by the English Pre-Raphaelite painter Dante Gabriel Rossetti. It hangs in the Walker Art Gallery, Liverpool, Merseyside, England.
Document 3: Alberto Savinio: Alberto Savinio , real name Andrea Francesco Alberto de Chirico (25 August 1891 – 5 May 1952) was an Italian writer, painter, musician, journalist, essayist, playwright, set designer and composer. He was the younger brother of 'metaphysical' painter Giorgio de Chirico. His work often dealt with philosophical and psychological themes, and he also was heavily concerned with the philosophy of art.
Document 4: Giuseppe Matteo Alberti: Giuseppe Matteo Alberti (or Giuseppi) (20 September 1685, in Bologna, Italy – 18 February 1751, in Bologna, Italy) was an Italian Baroque composer and violinist.
Document 5: Metaphysical Interior with Large Factory: Metaphysical Interior with Large Factory (1916–17) is a painting by the Italian metaphysical painter Giorgio de Chirico. It is part of a series that extended late into de Chirico’s career.
Document 6: A Vision of Fiammetta: A Vision of Fiammetta is an oil painting created by Dante Gabriel Rossetti, in the Pre-Raphaelite style, created in 1878. The painting was one half of one of Rossetti's "double works", accompanying his "Ballads and Sonnets" (1881). Maria Spartali Stillman modelled for the painting. The subject of painting is Boccacio's muse named Fiammetta.
Document 7: Alberto Jori: Born in Mantua, on his father's side he is the descendant of an old noble Swiss family of barons (Freiherren) from Ticino and patricians from Zurich. On his mother's side he is related to a long Jewish line of Mantuan rabbis, from which the kabbalists Moses ben Mordecai Zacuto (also known as the Ramaz), Solomon Aviad Sar Shalom Basilea and the mathematician Gino Fano were also members. He studied in Padua, Cambridge and Heidelberg and received a grant from the Alexander von Humboldt Foundation. In 2003, with his book on Aristotle, he won the prize of the International Academy of the History of Science (Paris, Sorbonne). He is Professor of Philosophy at the University of Tübingen, Germany, and is an exponent of the School of "Practical Philosophy".
Document 8: The Double Dream of Spring: The Double Dream of Spring (also known as Doppio Sogno di Primavera, 1915) is a painting by the Italian metaphysical painter Giorgio de Chirico.
Document 9: Gare Montparnasse (The Melancholy of Departure): Gare Montparnasse (The Melancholy of Departure) (Italian: "La stazione di Montparnasse)" (1914) is a painting by the Italian metaphysical painter Giorgio de Chirico. Many of de Chirico’s works were inspired by the introspective feelings evoked by travel. He was born in Greece to Italian parents. This work was painted during a period when he lived in Paris.
Document 10: Schubert's Dream of Spring: Schubert's Dream of Spring (German: Schuberts Frühlingstraum) is a 1931 German musical film directed by Richard Oswald and starring Carl Jöken, Gretl Theimer and Alfred Läutner. It is a biopic of the early Nineteenth century Austrian composer Franz Schubert. It was one of two films along with "Vienna, City of Song" (1930) with which the director paid musical tribute to his native city Vienna.
Document 11: The Song of Love: The Song of Love (also known as Le chant d'amour or Love Song; 1914) is a painting by the Italian metaphysical painter Giorgio de Chirico. It is one of the most famous works by de Chirico and an early example of the surrealist style, though it was painted ten years before the movement was "founded" by André Breton in 1924.
Document 12: Rêve de printemps: Rêve de printemps (en. "Dream of Spring") is a 1901 painting by William-Adolphe Bouguereau. The painting is an allegory of spring, it shows a young woman sitting in a forest surrounded by three small amores who crown her with a wreath of spring flowers as "déesse du printemps".
Document 13: Metaphysical Interior with Biscuits: Metaphysical Interior with Biscuits (1916) is a painting by the Italian metaphysical painter Giorgio de Chirico. It is one of the earliest editions in a series of works that extended late into de Chirico’s career.
Document 14: The Disquieting Muses: The Disquieting Muses (in , 1916, 1917 or 1918) is a painting by the Italian metaphysical painter Giorgio de Chirico.
Document 15: Girolamo Savoldo: Girolamo Savoldo, also called Girolamo da Brescia (c. 1480-1485 – after 1548) was an Italian High Renaissance painter active mostly in Venice, although he also worked in other cities in northern Italy. He is noted for his subtle use of color and chiaroscuro, and the sober realism of his works, which are mostly religious subjects, with a few portraits, which are given interest by their accessories or settings, "some even look like extracts from larger narratives".
ground_truth: Alberto Savinio
sub_queries: Who is The Double Dream of Spring by? Answer: Giorgio de Chirico
Giorgio de Chirico >> sibling Answer: Alberto Savinio