Prince Pedro Gastão was the son of Pedro de Alcântara, Prince of Grão-Pará and his wife Countess Elisabeth Dobrzensky of Dobrzenicz. He was born in Eu, France. His father was expected to eventually inherit the imperial throne of Brazil, as his mother was the elder child and heir presumptive of Emperor Pedro II. The monarchy was, however, overthrown in 1889 and the former imperial family went to France in exile. Until Dom Pedro de Alcântara's renunciation at the time of his marriage to a woman who was not of royal birth, he was to succeed his mother as imperial pretender, leading the Brazilian restoration movement from abroad. Pedro Gastão spent his youth in Europe, largely at his family's Parisian home in the Boulogne sur Seine suburb: "I have very good memories of my grandparents...In exile in France I was always brought up thinking of Brazil not France or Portugal." A few years before his death Pedro Gastão's father Prince Pedro de Alcântara told a Brazilian newspaper: Following the death of his father, and supported by Infante Alfonso, Duke of Calabria and Infante Juan, Count of Barcelona he declared himself head of the Imperial Family of Brazil. His position was supported by Francisco Morato, law professor at the University of São Paulo, who concluded the resignation of Pedro Gastão's father was not a valid legal or monarchical act. Professor Paulo Napoleão Nogueira da Silva in the 1990s published a report saying that the resignation of his father was invalid under all possible aspects of Brazilian Law. He represented a rival claim to that of his cousin's son, Prince Luiz of Orléans-Braganza, to be the heir of the deposed Emperor Pedro II of Brazil, despite the renunciation signed by his father in 1908 when he married, without dynastic approval, a Bohemian noblewoman. Pedro Gastão died aged 94 on 27 December 2007.
*Luna de Medina y Orléans-Bragança, :es:Condado de Ricla|Countess of Ricla
Prince Alfonso of Orléans-Braganza, married Maria Parejo Gurruchaga 3 January 1973, divorced with issue. He remarried Silvia-Amália Hungria de Silva Machado 19 November 2002.
*Princess Maria de Orléans-Bragança
*Princess Julia de Orléans-Bragança
Prince Manuel of Orléans-Braganza, married Margarita Haffner 12 December 1977, divorced 1995, with issue:
*Princess Luiza de Orléans-Bragança
*Prince Manuel de Orléans-Bragança
Princess Cristina of Orléans-Braganza, married 16 May 1980 Prince Jan Pavel Sapieha-Rozanski, 16 May 1980, sometime Belgian ambassador to Brazil divorced 1988, with issue:
Prince Francisco of Orléans-Braganza, married Christina Schmidt-Pecanha 28 January 1978, divorced, with issue. He remarried Rita de Cássia Pires 1980, with issue:
