The Collaborative International Dictionary of English v.0.48:

kinfolk \kin"folk`\, n.
   Relatives; kindred; kin; kinsfolk; persons of the same family
   or closely related families.
   [1913 Webster]

WordNet (r) 3.0 (2006):

kinfolk
    n 1: people descended from a common ancestor; "his family has
         lived in Massachusetts since the Mayflower" [syn: family,
         family line, folk, kinfolk, kinsfolk, sept,
         phratry]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "kinfolk":
   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, kinnery,
   kinsfolk, kinsman, kinsmen, kinswoman, kith and kin, near relation,
   next of kin, people, posterity, relations, relatives, sib, sibling,
   spear kin, spear side, spindle kin, spindle side, sword side,
   tribesman, uterine kin