NiFe2O4 (NFO) compound exhibit collinear-Neel-type ferrimagnetic behavior. A partial substitution of Fe3+ by rare earth (R) ion in the NFO samples results in a structural distortion and such a distortion induces the strain in the system which significantly modifies the magnetic and electrical properties. We propose to investigate the powder neutron diffraction (ND) patterns in order to determine the magnetic structure of NiFe2-xRxO4 (R= Dy, Lu, Yb, and Y) samples as well as their temperature dependence. In addition, we propose to study the cationic distribution of Ni2+, Fe3+, and R3+ ions in the octahedral/tetrahedral sites by analyzing the element-specific information that derived from the ND experiments. Our investigations shall offer further insight into the structure, cationic distribution, and magnetic properties of R-doped ferrites as interesting systems for novel magneto-electronic applications.