Possibly. or:
The person doing the filming (a brother?) saw what Dad was doing and had a strong feeling of how his brother would react. If it was a set up, I don't think the victim was in on it.
BINGO! And again, note that very authentic body language and voice tone of the dad expressing exasperation. Yeah, this could be staged but ONLY if both son and dad were professional actors. And good ones at that.