Conversation so far:
When was Immanuel Kant born?
Immanuel Kant was born on 22 April 1724.
Where was Immanuel Kant born?
Immanuel Kant was born in Königsberg, East Prussia.
Who were Immanuel Kant's parents?
Immanuel Kant's mother was Anna Regina Reuter and his father Johann Georg Kant.

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