I was SO excited to see your msg. on geneology.com! I too, am looking for family of a Matthaus Ruoff! Some of the information I have is different, but your info is the most similar I have seen so far.
Joseph Mattahus Ruoff m. Ana Katherine Rein in Germany came to America (date unknown)
Had a son Albert Nicholas Ruoff (my great grandfather) m. Clora "Faye" Pare settled in Pinkneyville, Illinois
They had a daughter Betty Kay Ruoff (my grandmother) m. Donald Ray Wilson Jr. Son John Wilson (my father)
We cannot trace Joseph Matthaus Ruoff or Ana Katherine Rein before they had my g.grandfather Albert. Please let me know if you think we have a match! Perhaps we have Ana's maiden name wrong. It also looks as though they went by their middle names.
I'm looking forward to hearing from you. I'm more than willing to share any info I have with you!