Kids... so fascinating. I'm single, and have never had any kids, so I don't know a lot about how fast they develop. (The caption of the video was written by the child's parents, I suppose.) I did have the pleasure of being a pre-school teacher for about 6 months. (Note: Within a week I asked to reduce my two 3 hours shifts (9-12 and 1-3) to just one shift, because I realized that a full six hours was making me impatient with the little tykes, and they certainly did not deserve that.)
I loved the 3-4 year old age because they seemed young enough that you can't really blame them for anything / can't hold them responsible. Once they get to be 5, then they develop this devious nature where they're trying to trick you and get away with stuff. Then they can be maddening, eh?! Haha.
I wanted to share this video, because I'm really fascinated by the look and expression on this kid's face. Watch him as he reacts to Darth Vader revealing that he is Luke's father. Now there's some people on Youtube who think the parents set this up and asked the kid to make expressions. If that's the case, his little boy is going to grow up to be Laurence Olivier or at least Peter O'Toole. His emotion starts with shock, but as the scene progresses you can see a real solemnity in his face as the gravity of this situation sets in. That's pretty heavy emotion for a 4 year old, and I'm curious to know how his little brain is working.
On a side note, I never thought about it, but this is probably partly what makes Star Wars so compelling to children. (I know I loved it as a kid.) Having your Daddy turn out to be a bad guy is something that would be meaningful to kids at a very young age, I suspect.