  Simple symmetry arguments applied to the third generation lead to a
prediction: there exist new sequential Higgs doublets with masses of order
$\lesssim 5 $ TeV, with approximately universal Higgs-Yukawa coupling
constants, $g\sim 1$. This is calibrated by the known Higgs boson mass, the top
quark Higgs-Yukawa coupling, and the $b$-quark mass. A new massive
weak-isodoublet, $H_b$, coupled to the $b$-quark with $g\sim 1$ is predicted,
and may be accessible to the LHC at $13$ TeV, and definitively at the energy
upgraded LHC of $26$ TeV. The extension to leptons generates a new $H_\tau$ and
a possible $H_{\nu_\tau}$ doublet. The accessibility of the latter depends upon
whether the mass of the $\tau$-neutrino is Dirac or Majorana.
