When I searched for Frank Joas the first thing that came up was on the Marchant family tree, so that's where I found the information about Joseph and Josepha. However, that person doesn't have many, if any, sources listed for validation. I did find a passenger list with Frank (listed as Xaver), Joseph and Josepha, their children: Joseph, Marianne, George and also other Joas': Veronica (age 32), Sebastian (age 14), and Veronica (age 7). Here is that link:http://search.ancestry.com/iexec?htx=View&r=an&dbid=...
Actually, the line after Joseph Joas on that tree goes back a few generations as well but with the only sources being other family trees. There is another family tree with pictures of Joseph's brother's family and quite a bit of information. Might be worth checking out if you are to renew your subscription.
I found that Joseph is listed in the 1870 census married to his second wife, Margaretha, living in Addison, WI. He died in 1878 so that might be the only census where you could find him.
I'm fairly certain that all the mix ups of Crescentia are still Katherine. I'm thinking Crescentia was her real birth name (after her mother) and maybe Katherine was a middle name or just a nickname or something.
I would love to see those photos!! My email address is my ancestry username at gmail. com.