  Grand gauge-Higgs unification of five dimensional SU(6) gauge theory on an
orbifold $S^1 / Z_2$ with localized gauge kinetic terms is discussed. The
Standard model (SM) fermions on the boundaries and some massive bulk fermions
coupling to the SM fermions are introduced. The number of the bulk fermions is
reduced compared to the previous model, which reproduces the generation mixing
of the SM fermions in addition to the SM fermion mass hierarchy by mild tuning
the bulk masses and parameters of the localized gauge kinetic terms.
