Since this posting a couple of days ago, I have made much progress on this family - I found their names in The Central Database of Shoah Victims' Names. Sadly, it appears that Josef (his wife, Louise & daughter, Ela), Ella, Irma, Paul (and his son, Rudi) and Rudi all died in concentration camps. I believe that Ella had a daughter who survived WWII, and immigrated to the US, and I'm trying to located her now. Walter immigrated to the US in 1913, and had one daughter. I was also able to confirm that Ernestine was Friedrich's 2nd wife.