But there were a few who thought the mom could have gone about this differently:
"ESH. I come from a divorced family and hated when mom or dad said bad stuff about the other one. I think you should have told him that he needs to stop saying that and to set the record straight. And if he doesn’t, then you will include the kids in on your budget as a way to teach them about money, and in turn, they will learn that their dad is full of it. But at least it wouldn’t look like you attacking their dad."
"ESH. Him for not paying his share, and you for turning the kids against the father. These are kids just entering their teenage years – there is a LOT about this situation they may not understand. It should have stayed between you and the father."
"You should have taken things up with your ex-husband before doing that. Also, I'm not trying to make it sound like not paying child support is okay, but you state that you live a 'pretty frugal life,' and dad only has the kids once a month. Maybe he is just trying to spend the little amount of time he has with his kids having a good time. Now, him telling lies is inexcusable, too, but you should have fought that out between you two. Maybe the unpopular opinion, but yes, you’re the asshole."