The spelling of the Dutch family name is rather complicated as it is spelled in many different ways such as Dommelshuizen, Dommershuizen, Dommershuyzen, Dommershuijzen, Dommerson, with occasionally the Dutch prefix van . Although the paintings are usually signed as Dommersen. Cornelis Christiaans older brother was Pieter Cornelis Dommersen (1833-1918), who was also born in Utrecht. Pieter Cornelis was a painter as well, gaining more fame than his younger brother. Both were the illegitimate sons of Cornelia Henriette Dommershuizen (in fact, Cornelia had 4 more illegitimate children). In around 1850 Pieter Cornelis Dommersen moved to England and stayed there till his death in Hexham in 1918. Pieter Cornelis Dommersen had a son called William Raymond Dommersen (1859-1927), who also became a painter in England.
Cornelis Christiaan specialized just like his brother in sea -and river scapes and coastal scenery as those paintings had found a revival during the 19th century in Europe. He traveled abroad to countries such as England, America, Belgium and France, just like his countryman Abraham Hulk Senior did. However, in the end he found satisfaction painting not only river- and seascapes in the Netherlands but also the interior of villages and towns along the rivers. On his travels, he was often accompanied by his brother and his nephew. He wappears to have been married twice without issue.