My email address is firstname.lastname@example.org
The family name Younker was changed to Yunker in 1920 with the birth of my aunt Doris. Why? I do not know at this point. In my research I can follow the line to Christian, beyond that I have not been successful. Without a Germen intermediator, further research is at a road block for me.
Siblings include Edna M., William F. (whom I descend from), and Harry L.
Have you performed a DNA test that we can compare? It would be interesting to see the amount of similarities.