Hi Gibel,
I really appreciate your efforts!
Unfortunately, we have no idea how old Rose/Rosa is/was. She is named as Godmother in Birgit's christening certificate in early 1949 and she took care of Emil during WWII and then his baby brother after the war, so I would be surprised if she was born after 1915, but I can't be sure of anything at all.
Emil was Oberleutnant, army.
Best regards,
Karen