The name Püstow is probably a mis-reading of Rüstow. So she is probably Bertha Ottilie Rüstow (not dauther of Lesette Kröger, but of Hedwig von Flotow. So NN. Püstow is Hans Rüstow and the son Hans Rüstow would be Hanns-Joachim Rüstow. Suggestion: Merge the profiles and change the mother.
