I don't know. I've never looked for any info.
I read the book when I was about 19 years old. And, at the time I didn't realize he was my Great-Uncle because he had a fairly common name.
Later, when I went home on vacation, I just happened to mention what I thought was a coincidence to my Mom. She started laughing...and then told me he was her Uncle. She thought I knew...everybody else did except me it seemed.