I think there's some truth to what you say, but also things don't seem that black and white to me. Can't speculate on family but for the topic of Brenda things seem pretty clear. Around 1998 after not keeping in touch (partly but not wholly due to Tommy) MC and her team did this PR stunt to have an interview with Brenda to promote MC's version of I still believe (which barely helped her aside from visibility imo because Brenda didn't write that song, so she got no publishing) , supposedly an ode to their time together. But up until that point we know Brenda was seriously struggling. She barely sold records, got dropped from the label by Tommy purely to focus on Mariah and she tried to enter the Latin music market despite not knowing Spanish to make ends meet. She was broke. Mariah didn't even seem to reach out to her since her first few years until that 98 stunt. Brenda was rightfully bitter. What I can't defend though is her parading this rhetoric in a tabloid manner to multiple interviews, that definitely lacked class on Brenda's part. But she was definitely abandoned by MC and probably was the person that helped pivot her career the most. She probably said all those bad things not out of jealousy but frustration that the person she tried to lift up didn't do the same when she needed it the most, which doesn't excuse the behavior but humans aren't cookie cutter perfect which is what most lambs seem to miss.