In my personal estimation, George has been the most forthcoming of all the Anthony characters. From the beginning, he has seemed to me and many others the "one" member of this family least likely to tell tall tales.
However: This man (as well as his wife and son) have been MARINATING in the effects of living with a sociopathic person whom they LOVE (Casey) and want to protect, and anguish over.
Most of us can't stand Casey. We have no emotional investment in her as a daughter or sister or mother. It's no problem to disdain her. For the Anthony family, this is not the case.
Loving a sociopath will make your head turn inside out. I see evidence of the entire Anthony family "suffering" from the effects of a long term intimate relationship with a sociopathic person. Try to look at it from THEIR point of view. Casey is someone they love and have much invested in, as we all do with our family members. We are just spectators to their tragedy.
I was married to a sociopathic person for seven years, and thankfully got brave enough to turn him into the local police and get protection. I ended up "disappearing" so he doesn't know where I am. In the last four years, I've recovered myself better than ever, but, the person I BECAME while intimate with this person was a pathetically passive, dishonest and dangerously oblivious version of myself.
I have no doubt I appeared very hinky. There was SO MUCH to cover up, mostly my own terrible shame because I KNEW there was something terribly wrong but did not have the courage to stand up to it and fight it.
I see George as having a similar kind of shame.
It does not absolve him of his own dishonesty and machinations. It only makes it understandable, and, that there is another storyline that makes sense of his behavior and words.
ETA: LOL forgot my original point. YES, George is lying. Has lied, probably will lie again. Of course he has. But not for reasons those who haven't had intimate relationships with sociopaths would immediately understand.
It reduces his credibility but does not negate it.