Originally Posted by
wanttobehealthy 
So, XAH saw the kids briefly on Fri and texted DD 11 and DD 8 after his visit to say he would sign them up to do a winter sport that I had told them I was unlikely to be able to afford to do.
They called XAH
He told them that he would "look into it" and told them that I am a "bad mother" for "involving them" in an adult issue that is between he and I. He also told them that they need to learn "what no means" and that they are "spoiled brats" for always asking for something
Yeah, unless there's something missing in the story and he told them at some point in the past that he changed his mind, he's trying to find a way to avoid seeing his own shortcomings by projecting them onto others. If I tell somebody I will do ________, but then I change my mind without telling them, it is only expected that they would come back and ask me, "Hey, are you still going to do ________ like you said you would?"
In other words:
He's getting mad because you didn't shelter him from having his children hold him accountable to his word.
This is alcoholic logic.