Final answer:
Gavrilo Princip, a member of the Serbian nationalist group The Black Hand, assassinated Archduke Franz Ferdinand and his wife Sophie on June 28, 1914, in Sarajevo.
Step-by-step explanation:
The father of Franz d'Epinay, a fictional character, is not the subject of the historical assassination described in the student's question. However, Franz Ferdinand, the Archduke of Austria-Hungary, was indeed assassinated. The person responsible for the assassination of Franz Ferdinand and his wife was Gavrilo Princip, a member of the Serbian nationalist group The Black Hand.
On June 28, 1914, during an official visit to Sarajevo, Bosnia, Princip seized an unexpected opportunity when the Archduke's motorcade took a wrong turn and stopped outside the café where Princip was present. Princip stepped outside and fired the shots that killed both Franz Ferdinand and his wife, Sophie.
It is crucial to recognize that the death of Franz Ferdinand's father is not historically documented in this context, as Franz d'Epinay is a fictional character, and his father's assassin, if mentioned in a literary work, does not pertain to actual historical events.