Left #19: Amalie Jahn Friederici, taken in London, between 1867 and 1868. A younger portrait of Amalie can be found on #16, and a contemporary photo on #19.

Middle #18: Alma Bettie Carrie Friderici (Herson), taken in London between 1867-1868.

Right #17: Probably Jennie Amalie Friederici, (born 1867) taken in London, between 1867-1868.

It is possible the right portait #17 could be little Oscar before the one year old died in 1869, boys were often dressed in a "unisex" fashion until at least the age of 4, therefore, the middle photo could be 2 year old Jennie. However, the photos were all taken the same day and it is most likely that one day Amalie brought her two daughters to have their photo taken soon after Jennie was born in 1867.