  A 5D SU(7) family unification model with two spinor representations of SO(14)
is presented. The fifth dimension is compactified on $S^1/Z_2\times Z_2'$. The
orbifolding is used to obtain 4D SO(10) chiral fermions. The 4D grand
unification group is the flipped $SU(5)\times U(1)$. The doublet-triplet
splitting through the missing partner mechanism is achieved. Also, fermion mass
matrices are considered.
