Conversation so far:
who was Franz Joseph I of Austria's mother?
Princess Sophie of Bavaria
was Franz Joseph I of Austria married?
Franz Joseph I of Austria married Empress Elisabeth of Austria
did Franz Joseph I of Austria produce heirs with Sophie Duchess of Hohenberg?
their first daughter Sophie died as an infant, and their only son Rudolf died by suicide in 1889

Question: were there any other children?
Self-contained rewrite: were there any other children b?y Franz Joseph I of austria and Sophie Duchess of Hohenberg?