He is married to Wilhelmine Henriette Zegers Veeckens.Source 2
They got married in the year 1897 at Ouchy, Vaud, Zwitserland.
Wilhelmina Henriette Zegers Veeckens, geb. Amersfoort 18 Jan. 1866, tr. Ouohy (Zw., Waadtland) in 1897 Ernest Rowell de Coppet, bankier. [New-York.]
Wilhelmina Henriette Zegers Veeckens, geb. Amersfoort 18 Jan. 1866, tr. Ouohy (Zw., Waadtland) in 1897 Ernest Rowell de Coppet, bankier. [New-York.]