The radio source at the center of the cool core cluster RBS 797 is known to 
exhibit a misalignment of its radio jets and lobes observed at different 
VLA-scale, with the innermost kpc-scale jets being almost orthogonal to the 
radio emission which extends for tens of kpc filling the X-ray cavities. 
This peculiar radio morphology may indicate a recurrent activity of the 
central radio source, where the jet orientation is changing between the 
different outbursts due to the effects of supermassive binary black holes 
(SMBBHs). Our recent re-analysis of VLA archival data further shows strong 
evidence of the presence of two pairs of kpc-scale jets ejected in different 
directions, indicating the likely presence of contemporaneous emission from 
two active SMBHs.
In this talk, I will show the results of new 5 GHz observations performed 
with the European VLBI Network (EVN). In particular, we detected two compact 
radio components, with a projected separation of ~77 pc. I will discuss two 
possible scenarios for the origin and nature of the EVN double source, 
showing that both interpretations are consistent with the presence of 
a SMBBH system in the BCG of RBS 797. 
I will also present new, high-resolution VLA observations of the cool core 
cluster A2626, which is known to possess a radio mini-halo at its center. 
The most unusual features of A2626 are three symmetric radio arcs, having 
morphologies not common to the typical jet-lobe structures in cool cores. 
I will briefly discuss the different possibilities for their origin, 
including the presence of two pairs of precessing radio jets.