Lathrop married a widow, Mrs. Cosby McDowell of Seattle in a 1901 ceremony in Valdez, Alaska, where Lathrop had taken up residence. This was the first wedding in the history of Valdez.
Lathrop tied the knot with Mrs. Cosby McDowell, a widow from Seattle, in a 1901 ceremony in Valdez, Alaska, which was the inaugural wedding ever held in Valdez.