[1][2] She was the fourth of five children: Constance "Conny", Maurits "Maus", Cecilius "Cecil", Cornélie "Cox" and Wilhelmina Adolphina "Dolph".

In 1921 Cox was in England where she nearly got engaged to her cousin Graaf (Count) Constantijn Willem Limburg Stirum (1900–1976)[8] before the family intervened.

Cox modeled for the artists of her day such as the French painter and pastelist Gustave Brisgand [fr], the sculptor and her Professor Toon Dupuis, and Piet van der Hem.

[citation needed] On 7 August 1930, Cox married Hendrik Gerard Johan "Henri" Völcker, Heer van Soelen en den Aldenhaag (Zutphen 16 October 1891, Utrecht 18 December 1955), Henri was the Lord Protector (heer beschermer) of the village of Zoelen a rural community in the Betuwe only accessible by river ferries.

[10] Neither the remoteness of her new home nor her married status stopped Cox from making regular trips to The Hague, to the beach at Scheveningen, to Leerdam, to Gouda etc.

After the benediction "The Lord Völcker van Soelen thanked all present for the extraordinary large turnout and, turning to the grave, he said the words: 'Farewell, darling treasure, who was my everything'".

[16] In 1930 it won a gold medal at the Wereldtentoonstelling voor Kolonien, Zeevaart en Vlaamse Kunst in Antwerpen (Belgium) (World Fair for Colonies, Navigation, and Flemish Art).