avuncular

from WordNet (r) 3.0 (2006)

avuncular
    adj 1: resembling a uncle in kindness or indulgence
    2: being or relating to an uncle

from The Collaborative International Dictionary of English v.0.48

Avuncular \A*vun"cu*lar\, a. [L. avunculus uncle.]
   Of or pertaining to an uncle.
   [1913 Webster]

         In these rare instances, the law of pedigree, whether
         direct or avuncular, gives way.          --I. Taylor.
   [1913 Webster]