Hello,
I'm grandougther Bernhard.
Brothers and sisters of Bernard were in Germany. I don't know all their names but I'm certain that he didn't have a Donald brother. If I'm correct his names were: Clara, Lourence, I don't know if he had someone more...
Could you contact
lkeuffer@orm.com.br ? Maybe he had some informations. He's my father.
Thank you, Agnes Keuffer Mendonça