I haven't found more info on Jonas Streb and Afra Blum other than what I found about their children on the historic marriage site.
I have been reading through LDS films of church records (baptisms) for Horden, Baden. I found "my" Jacob Streb, son of Balthasar Streb as well as John, Joseph, George, Frank and Anna Maria, all children of Lorenz Streb. The film starts with 1795, not far enough back to see how Lorenz and Balthasar might be related. Strebs where a large group in that congregation.
Do you know where Jonas Streb and Afra Blum came from? From looking at a map of Horden, Baden which is part of Gaggenau, Baden today, I see other town names that ring a bell in connection with Strebs.