looking for father

My husband is Thomas Edward Liston and he was born Aug. 2, 1949 in Vancouver, Wa. Thomas hasn't seen or heard from his father in about 46 years. We are currently trying to find if he is still alive or not. His name is Clarence Edward Liston. He left for Morocco sometime in the 1950's. My husband would like to find out if he has any relatives still living or not. Also any information about where he is or was and any relative information.