My name is Andrey Roth Ehrenberg,
I realize that by now you weren't expecting a response, anyway, I am Brazilian, my grandfather was born in 1922, in germany, i'm not sure where, but it was for sure not in the south, also his name was Helmut Heinz Ehrenberg. I'm not sure about my grand grandfather either but I have the book of the family somewhere in my house, there has the register of births from 18xx til my grandfather. I'll take a look at it. and if you answer this I will write more.
I think that my grand grand father's name is Richard Ehrenberg (or that was his brother, I'm not sure)
I know for sure that my grand grandfather came to Sao Paulo- Brazil and lived here 'til his death with my grand-grandmother.