Generalleutnant Georg Albrecht Ernst von Manstein, adoptive father of his nephew, Erich von Manstein, son of his brother and sister-in-law the (General) von Lewinskis.  Best regards, JR.

Papa Manstein (2)

Eduard Julius August Ludwig von Lewinski, General of Artillery and natural father of future Field Marshal Erich von Manstein.  Manstein had the somewhat unusual distinction of being the son of two Prussian aristocrat-generals.  General von Lewinski and his wife were, let us say, fairly prolific in the kinder department; the lady's sister and her husband, one General von Manstein, were not so fortunate.  So as to allow the Mansteins to found a family, the Lewinskis allowed them to adopt two of their children, a daughter and a son, of whom the future Field Marshal was the younger.  Best regards, JR. 

Papa Manstein (1)

General Eduard von Lewinski, photographed in 1904, with his five living sons including, at his left shoulder, 14 year old cadet Erich von Manstein, Lewinski's biological son and adopted son of his in-laws, the von Mansteins.  Erich's adoption was, clearly, a very open family arrangement.  How these various poeple addressed each other (Father, brother, cousin, brother ...?) is not, as far as I know, recorded.  Best regards, JR.