  We show that a special type of colliding 7-brane configuration of a
codimension-two singularity realizes not only a six-dimensional spectrum with
exactly the same quantum numbers as that of the three-generation E7/(SU(5) x
U(1)^3) coset family unification model, but also the three sets of nonchiral
singlet pairs with precisely the correct U(1) charges needed for explaining the
Yukawa hierarchies and large lepton-flavor mixings in a well-known seesaw
scenario.
