I'm no expert in child development. I did ask a friend who has a child via artificial insemination, nearly 3 years old, like Caylee. And this child is starting to ask about her father.
Sometimes I see people on this list with very emotional characterization of Caylee, "that precious little angel" and such. Caylee was a little person with her own personality, her own likes and dislikes. I contend that Caylee's questions, her likes and dislikes, make her an inadverdent player in this tragedy. Don't forget about her agency when thinking about what happened.
I still think that the stimulation of "father's day" would have generated Caylee's asking. Asking in that nearly 3-year old way, which is repetetive and relentless. Someone up there said that 2-year olds are not very verbal, well, this child was almost 3. She undoubtedly had "why" and "who" in her vocabulary. She watched television and heard about mommy's and daddy's, and eventually put it together that she, too, should have a daddy... and innocently asked about what the story was with her.
Also, Caylee was present for this yelling fight on Sunday night too. She would have been upset. She would have been crying. Perhaps she needed some Benadryl (chloroform?) to quiet her down?
Plus, there was so much effort apparantly put on by the family, trying to misdirect this event from Father's day -- trying to recast the day as June 9, etc. I just can't help thinking it was significant.