Quoting Chellie and Tyce:" Vent session begins.... I'm going through a divorce now for a year and a half. For the past year my ... [snip!] ... her mother who also isn't with my ex). I called my lawyer and he's going to deal with it but I'm honestly so smurfing choked."
Firstly, I understand your frustration at this point...it sounds, no offense, like he's pretty worthless. But, and I'm playing Devil's Advocate here only because there are always two sides (or more) to every story, is there a possibility that he got called into work or had some thing else that forced him to not be able to attend the camping? It's possible she wasn't lying to you but had something come up last minute and decided it was better to allow your son time with his extended family rather than make a scene right then about things.
Just throwing that out there...Maybe she's an evil crazy ex MIL like mine, I don't have that answer...lol