The Fenns return to the US on S.S. President Jackson, which sailed from Japan to San Fransisco. They departed Japan on April 21, 1927 and arrived in San Fransisco on May 6, 19271.
References:
“California, U.S., Arriving Passenger and Crew Lists, 1882-1959. M1410 – San Francisco, 1893-1953.” National Archives and Records Administration.