next of kin

from WordNet (r) 3.0 (2006)

next of kin
    n 1: the person who is (or persons who are) most closely related
         to a given person

from Moby Thesaurus II by Grady Ward, 1.0

42 Moby Thesaurus words for "next of kin":
      agnate, ancestry, blood, blood relation, blood relative, clansman,
      cognate, collateral, collateral relative, connections,
      consanguinean, distaff side, distant relation, enate, family,
      flesh, flesh and blood, folks, german, kin, kindred, kinfolk,
      kinnery, kinsfolk, kinsman, kinsmen, kinswoman, kith and kin,
      near relation, people, posterity, relations, relatives, sib,
      sibling, spear kin, spear side, spindle kin, spindle side,
      sword side, tribesman, uterine kin