  Multi-critical behavior of interacting fermions in graphene's honeycomb
lattice is presented. In particular, we considered the spin triplet insulating
orders, where the spin rotational symmetry of the order parameter is explicitly
broken. By casting the problem in terms of Gross-Neveu-Yukawa theory we show
that such symmetry-breaking terms are irrelevant near the metal-insulator
critical point. A finite Yukawa coupling among bosons and fermions improves the
stability of such critical point against the symmetry-breaking perturbations.
Physical sources of such symmetry-breaking terms are pointed out. Critical
exponents are calculated near the transitions as well.
