 In 1845, Sainsevain married Paula Suñol (1827–1883), whose father Antonio Maria Suñol owned Rancho Los Coches.In 1846, Sainsevain and Charles Roussillon built a schooner (the "Antonita") on the beach at Santa Cruz.She was launched on June 25, and sailed to the Sandwich Islands (Hawaii) to have a copper bottom installed.