Hello Alfred, There is a new belgian book called "Duiken naar oorlogswrakken" from Vic Verlinden. In the book are 6 pages dedicated to the Bruno Heinemann with a lot of pictures from recovered artefacts, underwater pictures... Maybe you can contact Vic Verlinden in Facebook, i am sure that of you tell him your story and that you had family on the Bruno, he'll be glad to help you with more information/pictures.
Kind Renards,

Raf