  In a (0,1) supersymmetric (SUSY) six-dimensional gauge theory, a gauge
fermion gives rise to box anomalies. These anomalies are completely canceled by
assuming a vector multiplet of (1,1) SUSY. With a T^2/Z_3 orbifold
compactification of the extra two dimensional space, the theory provides three
chiral multiplets and three equivalent fixed points. We regard them as the
origin of the three families of quarks and leptons. Quasi anarchy structure in
the SU(5)-5^* representation sector and hence the bimaximal mixing in the
neutrino oscillation are explained quite naturally in this framework. We also
discuss a family symmetry as a remnant of the higher-dimensional R symmetry.
