I am looking for information on Heinrich Märte (my grandfather) and his family. He was born on July 1, 1912 in Sipplingen and died On April 19, 1944 when the military plane crashed in Geierswalde because its engine failed.
I am not sure if his family knows that he fathered my dad. I am hoping someone knows of him or his family. I would love to know how he met my grandmother or any further information on him.
We have always had two photo's of him, but never knew his name. We have only just found out about him and it has opened so many more questions.
How can I determine Heinrich's parents and siblings, and then locate any living family members?