On his return to France, on 24 March 1908 Dubois married Louise Tribert, 30-year-old daughter of Senator Louis Tribert (1819–1899). They were to have five children. His wife's dowry allowed Dubois to pursue further ventures. In January 1913 he launched a company with a capital of 6 million gold roubles to exploit the resources of the Kuznetsk Basin in Siberia. He also became involved in diamond mines in the Altai. Long after the revolution of 1917 swept the Tsars from power, Dubois entertained hopes of recovering these investments. During World War I he traveled to Canada, where he became interested in the Alberta oilfields, and continued to invest in this area until at least 1925, again losing his money.