In the HS games I've done where a parent comes rushing onto the court/field, it has always been during a dead ball period. I've got no problem with this behavoir. I always do the "beckon" mechanic to show that I'm allowing them to enter the court/field.
If a coach really wishes to earn points via a technical foul because an opponent's player's parent came onto the court, then I will ask him if s/he wishes to be the cause of a technical foul if it were his/her injured child that s/he wished to attend to.
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Pope Francis
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