Narrative
The 3 oldest children in this picture were all born in early 1900:
- Marie-Rose, born in 1908
- Ivanhoe, born in 1911
- Paul-Émile, born in 1912
The next child, Gertrude, was born in 1917.
Assuming the picture was taken around 1915 or 1916 prior to the birth of Gertrude, that would make the children about 7, 3, and 2 years old.
