nonkin

Noun

 * 1)  A person who is not one's relative.
 * 2) * 1969, Frederic H. Chaffee, American University (Washington, D.C.). Foreign Area Studies, Area Handbook for the Philippines (page 176)
 * When it is necessary to state an unpleasant truth or an opposing opinion, or to make a request of a nonkin, it is done in as pleasant a speech as possible.