Conversation so far:
Where was Isaac Asimov born?
his family lived in Petrovichi near Klimovichi, which was then Gomel Governorate in the Russian Soviet Federative Socialist Republic.
Are there any other interesting aspects about this article?
In 1921, Asimov and 16 other children in Petrovichi caught double pneumonia.
Was he hospitalized because of the pneumonia?
Only Asimov survived.
Who were his parents?
Asimov's parents were Anna Rachel (nee Berman) and Judah Asimov.
Did he have any siblings?
He later had two younger siblings: a sister, Marcia (born Manya, June 17, 1922 - April 2, 2011), and a brother, Stanley.
Where any of the children who died from pneumonia his siblings?
CANNOTANSWER.
Did they ever move from Russia or did he spend his whole childhood there?
His family emigrated to the United States when he was three years old.

Question: Why did they move to the United States?
Self-contained rewrite: Why did Isaac Asimov and family move to the United States?