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Simeon married Princess María of Bourbon-Two Sicilies, daughter of Infante Carlos, Duke of Calabria and his wife Princess Anne of Orléans, on 13 July 1996 in La Toledana, Spain. Simeon is a (half) second cousin of his wife's father, both being great-grandchildren of Robert I, Duke of Parma. María's father descends from Duke Robert's first marriage and Simeon from the Duke's second marriage. The couple has five children.
de Badts de Cugnac, Chantal. Coutant de Saisseval, Guy. Le Petit Gotha’’. Nouvelle Imprimerie Laballery, Paris 2002, p. 172-174, 196-197, 404 (French) ISBN2-9507974-3-1
Genealogisches Handbuch des Adels, Fürstliche Häuser XV. "Spanien". C.A. Starke Verlag, 1997, pp. 104-105. (German) ISBN3-7980-0814-0.
Generations are numbered by male-line descent from the first archdukes. Later generations are included although Austrian titles of nobility were abolished in 1919.