Hello Paula, My Name is Kevin Ulm, My Grandfather was Armin Ulm, Your great grandfather's Brother. I do have some information about that side of the family. Although I have hit a dead end at Charles Byrum.
Unfortunatly, because of estrangement, I have never met any member of the Ulm family. If you have first hand information I would love to hear from you and fill you in on what I know.