<human>: My whole family is very tight and my cousin is going through a horrific experience with her kids, and I'm wondering if anyone has advice on how I can help the situation -- if there's anything I can do. 

She has two kids, one is 14 and one is 12. My cousin is a great mom, very loving -- she separated from her wife about five years ago because her wife had an affair and they've had joint custody of the kids. Over the course of the past year or so, her kids have completely turned on her, saying they hate her, calling her a bitch, saying they wish she would die, etc. My cousin is the "strict" parent and they get away with whatever they want at their other mom's house (no curfew, etc). My cousin thinks her ex is putting them up to this behavior, and basically brainwashing them into thinking she's a terrible person. From my perspective, o the outside looking in, none of their behavior makes sense. It's worse than normal teen "acting out." 
Has anyone else dealt with similar situations?
Any advice on anything I can say to the kids without further alienating them, but trying to get them to see that their mom (my cousin) isn't the devil?
Any thoughts or advice would be appreciated. 
Thanks.

Condense the text into a few key points
<bot>: my lesbian cousin separated from her partner, they have two kids who now treat my cousin like she's the devil. She's not. Is there anything I can say to the kids to help?