Sorry. I deleted my post after seeing you reply to someone else. I realized I was repeating the same thing someone else had said.
One thing I did want to say is that my parents did my taxes until I was 25. I had to give to them paperwork for that every year. Also, if they had asked me, I would have shown they paystubs and even deposits into my bank account, especially during the time that I was living with them. Casey was still living at home off of her parents. They had every right to investigate and see if she was really working. Instead, Cindy indulged in a fantasy world that did not match reality and prevented George from destroying that fantasy world. Now if Casey lived on her own and paid for herself, then her parents had no right to see if she was really working. But she was living under her parent's roof, and that means she should have been abiding by their rules. But she refused to, and Cindy just made herself blind to it. George took it even further by going to where Casey worked and of course, verified she didn't work there. Cindy could have done that as well, but she never did, never bothered to do so. There are many, many ways to verify employment. It's not impossible to do.
Now maybe they didn't have a standing legally to get this info on their own, but they certainly could have demanded it from Casey, and never did. Or go to her job and ask if she worked there. I'm sure they could have gotten that information quite easily.
All IMO, btw. And I'm trying to be respectful. I hope I don't come off any other way.