  A model of split left-right symmetry is proposed, where the first family of
quarks and leptons transforms under $SU(2)_R$ but the heavier two families do
not. The Higgs scalar sector consists only of an $SU(2)_L$ doublet and an
$SU(2)_R$ doublet. The $u,d$ quarks and the electron, as well as the neutrinos,
are massless at tree level, but become massive radiatively through their
interactions with a simple dark sector. Verifiable consequences include $Z'$
and Higgs properties, neutrino mixing and rare decays, etc.
