#3 Left: Possibly one of the Birkholz children, perhaps Emil, taken in Frankfurt an der Oder in 1874. By the 1880's Emil lived in Berlin. The Birkholz children can be found on #23.

#2 Right: Possibly a niece of Amalies, either Birkholz daughter, (a younger portrait can be found on #23) or Gertrud Noark, taken in Frankfurt an der Oder, from the 1870's or later. A much younger girl can be found on #7.

 

Both photos are unknown, but are the age to be the niece and nephew of Amalie and Ferdinand's.