Maybe, but now you've changed your argument. Previously it was that they weren't learning at all, now they aren't learning as well. Even so, there are points in response:

1. I'm really not equipped to show him the multiple images of a coat or someone putting on a coat, or other children doing signs of coat. The video is. I don't know if this matters or not. It's certainly possible it doesn't.

2. I have to make dinner for us all at some point. As much as I'd love for my 15 month old to patiently engage in conversation with me while remaining a safe distance from the stovetop, it just doesn't happen. There are times when a parent's attention just cannot be 100%, or even 75% on their child. So yes, maybe he would learn EVERYTHING better if I were there to teach it to him, but the fact is that even the best parents can't be.