Within the family, the systems with triels and tetrels are the most explored and within this group, silicides show perhaps the highest compositional abundance and variability. For instance, known isothermal sections of the R-Ni-Si systems are represented by at least 20 compounds (Ce 10 , Gd, Dy. ), while already 31 compounds have been reported in the La-Ni-Si system, 14 although no systematic explorations have usually been performed and more efforts are still required to uncover the full picture. Despite intensive but unsystematic structural screening, much less attention has been paid to the physical properties. However, some of them have already found their applications as thermoelectrics, high-temperature coatings, 16 magnetocalorics, or electronic components . To a lesser extent, they have been explored as battery anodes, in hydrogen storage or catalysis. Within the compositional and structural variability of the La-Ni-Si system, multiple compounds form closely related groups, of which two homologous series based on AlB2-type building blocks attracted our attention, namely La(n+1)(n+2)Nin(n-1)+2Sin(n+1) and Lan(n+1)+xNin(n+5)+ySi(n+1)(n+2)-z 14 with the clear exchange of the formal cationic and the anionic components. These two series represent practically isostructural compositional mirrors, i.e. La-and Ni-rich reflections. While Ln-rich representatives were observed before, Ni-rich ones were known only for pnictides (solely P and As) and appeared as a surprise. Moreover, their mutual appearance in the same system was unprecedented. Therefore, we decided to expand our investigation into related systems with heavier lanthanides. In this work, we report structural investigation as well as physical properties characterization of three Ni-richer homologous groups with Ln = Ce, Pr and Gd and n = 4, 5 and 6.