Aboard ship, he met and developed an intimate relationship with Mrs. Rachel Hobson Holmes, who was coming to California to join her husband, Captain A. C. Holmes, a Danish seaman. They traveled together from San Francisco to Monterey where they both boarded at the Cooper house. When Rachel learned she was carrying Thomas’ child, she discreetly moved to Santa Barbara while Thomas remained in Monterey, working with his brother. At Santa Barbara, Rachel gave birth and awaited a dreadful reunion with her husband, but within a few weeks, she learned that her husband had died a year before while at sea en route to Lima.