Conversation so far:
Where was Immanuel Kant born?
Immanuel Kant was born into a Prussian German family of Lutheran Protestant faith in Königsberg, East Prussia.
When was Immanuel Kant born?
Immanuel Kant was born on 22 April 1724.
Who were Immanuel Kant's parents?
Immanuel Kant's mother and father is Anna Regina Reuter and Johann Georg Kant respectively.

Question: did he have any siblings?
Self-contained rewrite: Did Immanuel Kant have any siblings?