Not much info. online other than he was born in 1848 to a wealthy family who had made their money in textiles and real estate during the redevelopment of Paris in the 1860s. He trained as an engineer before turning to paintinghttp://www.humanitiesweb.org/human.php?s…
If you have access to a library, you could try to get hold of Brodie, Norma. Gustave Caillebotte
and the Fashioning of Identity in Impressionist Paris.
New Brunswick : Rutgers University Press, 2002.
If there are more details then they would surely be ini the biography in this book.