Bibbity, did you somehow not see the rest of Smileless' sentence? It's:
"Make no mistake Bibbity of the extent some AC who've CO their parents will go to to try and disrupt the relationships their parents have with their siblings."
Iows, in Smileless' opinion (if I'm reading correctly), "Some ac who have co their parents will also go to great lengths to try to disrupt the relationships their parents have with their siblings."
You may not agree with her, but that's what she's saying.
I'm Sure It's a Repeat of the Summer of 1976


