= Mo, Se, S)*

Motivated by the search for type-II multiferroics, we present an optical study of a complex oxide family of type-II multiferroic candidates: RbFe(MoO₄)₂, RbFe(SeO₄)₂, and RbFe(SO₄)₂. We employ rotational-anisotropy second harmonic generation spectroscopy (RA SHG) to address discrepancies in reported space groups. Additionally, we present temperature-dependent linear optical characterizations near the band edge of this family of materials using ultraviolet-visible (UV-VIS) absorption spectroscopy. Included is experimental evidence of the band gap energy and band gap transition type for this family. We also show unreported sub-band gap absorption that reveals prominent optical transitions. Finally, we discuss the impact of these optical transitions as well as the implications of the point symmetries in each material at various temperatures.