I shall discuss how could emerge in the sneutrino sector in the NMSSM extended with right-handed neutrinos. I shall start with an introduction to sneutrino-antisneutrino oscillations. I shall then discuss how right-handed sneutrinos can be produced through the heavy Higgs portal and how this can lead to a same-sign dilepton signature in the presence of light higgsinos. I shall discuss the prospects of finding an excess at the LHC and if such an excess were seen, how could we extract information on the neutrino mass generation mechanism.