  It now appears phenomenologically that the third family may be essentially
different from the first two. Particularly the high value of the top quark mass
suggests a special role. In the standard model all three families are treated
similarly [becoming exactly the same at asymptotically high energies] so I need
to extend the model to accommodate the goal of a really different third family.
In this article I describe not one but two such viable extensions, quite
different one from another. The first is the 331 model which predicts
dileptonic gauge bosons. In the second, using as a flavor symmetry a finite
nonabelian dicyclic $Q_{2N}$ group, I show how to derive quark mass matrices
with two arrangements of symmetric texture zeros which are phenomenologically
viable. Three other such acceptable textures in the recent literature are
unattainable in this approach and hence disfavored. I assume massive
vector-like fermions and Higgs singlets transforming as judiciously-chosen
$Q_{2N}$ doublets and use the tree-level mass generation mechanism of Froggatt
and Nielsen.
