Hello again, Jeffrey,
you are welcome.
You say "As for the Behrens side, there it maybe will get more difficult."
I do not anticipate those difficulties. The Behrens-research is a feasable
task for an experienced researcher. The sources are available to everyone
over here in our archives. No need for patching an ances-tree together
from unsourced scraps found in the web.
Greetings from your roots,
Klaus (Struve), in Kiel, SH