1911–1913
![Schwester Grace mit Katze](https://peifferwatenphul.de/wp-content/uploads/2018/10/MPW_Gemälde_1917_Schwester-Grace-mit-Katze_InvNr_G1_sRGB-568x800.jpg)
Max Pfeiffer moved in May 1911 to Hattingen an der Ruhr, where his stepfather had been named director of the Realgymnasium. Attended the Gymnasium in Hattingen. Max Peiffer was a good pupil, interested in physics and the natural sciences. His half-sister Grace Watenphul was born in 1913.