Hi Marilyn The world is small ;-) yes, I am in contact with Dennis - but did not know that he is your brother.
My grandmother's name is Johanna Paulina Joller (born Christen), she is 97. Her parents were Josef Remigi Robert Christen and Rosa Maria (born Christen also).
As I wrote to Dennis today I have a contact in Germany who is also researching the Christens. I have asked her if she knows anything about the Büren branch of the Christens. If I find out anything I let you know. Rgds Gaby