It's not unlike herding cats.
This brief video, taken from my i-Phone, illustrates how three grandsons can be completely uncooperative, while giving the appearance of participating in a brief group video.
The occasion was a birthday party (for me) and Emilie (youngest and childless but holding her nephew in the video - right) gave me an Arkansas Toothpick for my birthday because presumably I needed one. The Romans would have called it a gladius...
But I digress. Listen to the cooing and strange noises coming from composed adults, all in the effort to elicit a smile from a child.