Franz Josef was the eldest son of Archduke Franz Karl, who was brother and heir of Austrian Emperor Ferdinand I. Because his father renounced his claim to the throne, Franz Josef became emperor when Ferdinand abdicated near the end of the Revolution of 1848.
In 1854 Franz Josef married Duchess Elisabeth in Bavaria, who became Elisabeth of Austria ("Sisi" or "Sissi").
SeeOtto von Habsburg for a photograph of Franz Josef with his great-grandnephew Otto, the current head of the Habsburg family.