On an oft occasion over the yrs, I was pressed into action to call my son's Rec League games. These were Rec Games, and everyone in the league knew I was the only State Certified Official in the league. The coaches or league officials came to me and asked me to do it, usually at game time (my stuff always in the car), as that was a better option than one inexperienced HS kid or NO officials (some might argue that
). Never had an issue.
BUT, that was Rec Ball. At the scholastic level, I too always informed the Assignor of the situation and blocked my son's games/dates in Arbiter and never did one of his or another game while he played. I would politely turn it back. But, unlike Bob's suggestion, which I understand, I would not volunteer to do another game to help out the Assignor and miss my kid play. Just me.