  We study supersymmetric models of lepton and baryon number violation based on
an abelian family gauge group. Due to possible lepton-Higgs mixing, the lepton
violating couplings are related to the Yukawa couplings and may be generated by
them even if they were absent in the original theory. Such terms may be
dominant and are not given by the naive family charge counting rules. This
enhancement mechanism can provide an alignment between lepton-number violating
terms and Yukawa couplings: as a result they conserve quark flavour. A natural
way of suppressing baryon number violation in this class of models is also
proposed.
