Respectfully, it's not as if this situation is really all that unusual -- didn't Susan Smith, Andrea Yates and most other parents who murdered their children have parents or other family members? Close friends?
From my observation, in cases with which I am familiar, the big difference is that most family members tend to behave as the previous poster suggested. Most often, family members accept the obvious and painful truth very early on, rather than go on media tours decrying every bit of evidence pointing toward their loved one, even claiming that 'science is just science' and 'that dead body in my granddaughter's car was not my granddaughter' etc.
When I read a post wherein the poster believes they would not generally behave as the Anthony family has behaved, I'll give them the benefit of the doubt that they would not. After all, by my observation, the odds are greatly in their favor.
Furthermore, I'll assume they base that on their life experience, knowing they haven't spent their child's life enabling, even aiding and abetting at times, their other crimes, or at the least, continually covering for them and doing everything in their power to avoid consequences being suffered by their loved one.
When I read a post wherein the poster is unsure of how they would behave, I also accept that as a true statement. Perhaps they do not have children or have very young children or were blessed with very good children and don't have the life experience to make an informed estimate of potential future behavior under similar circumstances. But again, perhaps one with an opposing viewpoint does.
Given their statements early on, I think it's possible, at a very vulnerable time, they allowed themselves to be talked into their 'state of denial' and subsequent actions by some with, at best, very questionable motives. And there is a real possibility in my mind that at least some of their behavior was orchestrated by the defense. Denial or no denial, some of the things they've said and done make no sense to me otherwise.
Was going for my two cents, you got about $3.25. Ooops.