It's the assignor's job to avoid these conflicts. When I assigned high school softball and volleyball in my area, I had a line on the availability form: "Are you, or a relative, associated with any school in our area"? We had teachers and parents who didn't work those schools' games, home or away. When my sons were in high school, I didn't work any of the sports where that school was involved, even though they didn't play the sports I officiated. When they graduated, no problem.
Bob
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