Additional information such as approximate birth years and the names of the other family members may help -
http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbas...Info from the emigrant protocol out of the port of Stavanger.
There is a 20 year old seaman listed in the Rogaland area in the 1865 census, a possibility -
http://www.rhd.uit.no/ftsoek/ftsoek.asp?kommando=bosted&...Especially interesting because there are a few farms in the parish his father lists as birthplace called "Gjesdal" and "Gjæsdahl"... perhaps a historical family connection.