Frank Swan was a cousin to Frederick W. Macondray, Jr. As a child, Macondray had moved in 1849 with his father, mother, and brother from Dorchester to San Francisco, where his father established the commission house Macondray & Co. with partners R.S. Watson and James Otis. Macondray, Jr. eventually took over the company in 1875.
From the description of F.H. Swan letter : Dorchester, Mass., to Frederick W. Macondray, Jr. : ALS, 1852 June 6. (California Historical Society). WorldCat record id: 122368987