Royal Profile: Prince Sergius of Yugoslavia

Prince Sergius Vladimir Emanuel Marie of Yugoslavia was born 12 March 1963 as the youngest son of Prince Alexander of Yugoslaiva and his first wife, Princess Maria Pia of Savoy {Source}. He has four brothers and a sister, one of who is his twin and a younger brother who is his half-brother {Source}:

1. Prince Dimitri of Yugoslavia (1958)
2. Prince Michael of Yugoslavia (1958)
3. Princess Helene Olga Lydia Tamara Maria of Yugoslavia (1963)
1. Thierry Gaubert (m 1988)
1. Milena Maria-Pia Angelique Armaule Gaubert (1988)
2. Nastasia Marie-José Tania Vanessa Isabelle Gaubert (1991)
3. Leopold Umberto Armand Michel Gaubert (1997)
4. Prince Dushan Paul of Yugoslavia (1977)

On his mother's side, she has the following step-siblings and step-nieces and nephews from his stepfather, Prince Michel of Bourbon-Parma:

1. Princess Inès Marie Josephine Marguerite Yolande Tatiana of Bourbon-Parma (1952-1981)
1. Miss Marie Mélodie de Bourbon (1977, adopted 1982, by her grandfather Prince Michael of Bourbon-Parma)
2. Prince Erik Marie Joseph René Michael Pierre of Bourbon-Parma (1953)
1. Countess Lydia afHolstein-Ledreborg (1955, 1980-1999)
1. Princess Antonia Monique Charlotte Marie of Bourbon-Parma (1981)
2. Princess Marie Gabrielle Yolande Camilla Philippine of Bourbon-Parma (1982)
3. Princess Alexia Thérèse Sybille Eric Charles Marie of Bourbon-Parma (1985)
4. Prince Michel Knud John Marie Joseph of Bourbon-Parma (1989)
5. Prince Henri Luitpold Antoine Victor Marie Joseph of Bourbon-Parma (1991)
1. Archduchess Gabriella of Austria (engaged 2017)
1. Victoria Antonia Marie-Astrid Lydia de Bourbon-Parme (2017)
3. Princess Sybil Marie Josephine Anne Victorie of Bourbon-Parma (1954)
1. Craig Richards (m. 1997)
4. Princess Victoire Maria Pia Josephe Philippe Isaure of Bourbon-Parma (1957-2001)
1. Baron Ernst von Gecmen-Waldek (1943)
1. Baroness Tatiana von Gecmen-Waldek (1974)
1. Michael Berger-Sandhofer (m. 1995)
2. Baron Vincent Nicholas von Gecmen-Waldek (1981)
5. Prince Charles-Emmanuel Marie Joseph Jacques Hely of Bourbon-Parma (1961)
1. Constance de Ravinel (1971)
1. Prince Amaury Yves Michel Marie Joseph of Bourbon-Parma (1991)
2. Princess Charlotte Alexe Yolande Marie Joseph of Bourbon-Parma (1993)
3. Princess Elizabeth Flore Angélique Marie Joseph of Bourbon-Parma (1996)
4. Princess Zita Angélique Inès Marie Joseph of Bourbon-Parme (1999)
6. Ms. Amélie de Bourbon de Parme (1977)
1. Igor Bogdanoff (1949, m 2009)
1. Master Alexandre Bogdanoff (2011)

He married Sophia de Toledo on 6 November 1985, and they were divorced the following year without issue {Source}.