A gap in the family tree - the unknown mother

Does anyone know this photo from a military hospital on the Western Front during the First World War? Does anyone know other people in this photo?
It shows a male military nurse from Berlin/Germany wearing an armband, who (presumably there) fathered a son with a nurse of unknown name and wanted to live with them. But he died in 1918, and we are urgently looking for this son, his mother and their descendants.
We have searched all possible archives, but in vain. We are working with DNA genealogy, because the likeable military nurse Paul Jungnickel by name already had a son at home and his grandson is now looking for his uncle and his family.
Does anyone know of a Belgian/French (?) nurse who worked there or in the neighbourhood in 1916-1918 and could not/was not allowed to say that her son was descended from a German soldier?
Many thanks for thinking about this!
Here the male nurse Paul Jungnickel in about 1917.
We are looking for his son and his mother - a Belgian/French (?) nurse.
Comments
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All persons are Germans in the picture,including the woman.If there are no indications as to where this foto originates, could be Belgium but where?,…i can see only two clues. Probably Christmas 1917 (tree) so you have the date of…second clue, there is a high ranking officer standing to the left of the tree.If recognised ;he could indicate the location of the picture.The entire story however,has some loose hinges.The Germans and the German red cross,and their nurses,worked on their side of the trenches,…they did not work with enemy-related persons what so ever.
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