I cannot find anything on the son of albert camus.  His name was Jean
and he was a twin with sister Katherine, whom I found oodles of
information about.  any suggestions?

Hi: 

I tried searching in French:

"albert camus" fils "jean camus"

but was only able to come up with these two pages with photos.

http://mael.monnier.free.fr/bac_francais/etranger/viecamus.htm

http://lyc-llg.scola.ac-paris.fr/ancienseleves/photos/

websearcher-ga

I'm afraid you may not find much more as, according to Catherine, Jean
Camus keeps a low profile.

Question: "You are his state executor. Is your brother still alive?
[They are twins.]

CC: [Catherine rips the filter of her cigarette and puts it in a black
cig holder.] Yes and no. My brother never talk about himself. There
are many things I knew. I knew everything of what The First Man
speaks. But I never speak of my brother. He don't want. "

http://www.3ammagazine.com/litarchives/2003/jan/interview_catherine_camus.html