Photo from the Broese van Groenou family archive / Emilia Broese van Groenou (1876-1960) was the mother of Dorothea (Thea) Coops and Wilhelmina (Milisa) Coops
Dorothea (Thea) Coops was the sister of Wilhelmina Coops.
Thea Coops wikipedia:Thea Coops