Conversation so far:
where was Immanuel Kant born?
in Konigsberg, Prussia .
when was he born?
Immanuel Kant was born on April 22, 1724.
who were his parents?
His mother, Anna Regina Reuter (1697-1737), was also born in Konigsberg to a father from Nuremberg.

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