On the WWII+70 thread it had the account of the bombing. The plane took several runs at the primary city, but smoke obscured the bombing site. So they went to Nagasaki instead.
I knew it wasn’t the primary target. About 15 years ago a friend told me all the details of the bombing. He was 4 years old and lived on the outskirts of Hiroshima. Yes, he did lose extended family but not immediate family.