This sounds like Munchausen by Proxy syndrome, when allowed to continue untreeated to an inevitable conclusion.
I'll give credit to the Mom for being diabolically smart, if she just abused her kids, they'd have been taken away. By picking making them "untouchable" (you just hate me and my kid because it's transgendered you bigot!!!) she not only can get away with it, but she can get all of the attention she's craving.
That is *exactly* what this is and the parents need major psych help.