I was curious about that as well, especially after Kathie said she couldn't cross her legs at 255 pounds. When I started my "weight loss journey" last year I weighed 30 pounds more than that and was able to cross my legs "like a lady" (I'm the same age as her). Granted, it's a lot easier now that I've lost 85 pounds, but I was able to do so. But if she's a lot shorter than I am, that may make a difference.
I agree with the comments that Josh just needs to see a therapist and write off his dad. Sometimes, you just have to give up on getting people to care about you, even if they are related to you. However, I was impressed that he was able to get his act together after falling off the wagon, so to speak. I've had to do that a couple of different times over the past year. Sometimes, you just need a damn candy bar (or ice cream, etc.). The important thing is to say to yourself, "okay, I've had my break, time to get going again." And then do it.