In this talk recent Raman scattering data will be presented. The acquisition of this new data was made possible after a successful growth of high quality single crystals of (CaLa)₁(BaLa)₂Cu₃O_y. In this YBCO-like compound the Ca to Ba ratio designate a specific family. Each family has its own phase diagram, with variation of optimally doped transition temperature, Tc^max, of about 30%. The Raman scattering peak from magnons is used for the determination of the superexchange coupling strength, J, in the antiferromagnetic phase. The Raman peak was measured for several samples from different families. It is found that Tc^max is proportional to the Raman shift, as measured from different underdoped families having the same number of holes. It is also found that T_N is proportional to the Raman shift of the fully underdoped samples. Finally, the method of extracting J from Raman scattering spectra will be compared to the method of extracting J using muSR.