Jewish law extends this to all relatives of the accused. G-d therefore wished that human justice should be executed only an the basis of the strongest and most authentic evidence. To this end Me disqualified the testimony of all relatives. This exemplifies the ways of the perfect Torah which always keeps us far from things liable to mislead and cause harm to man. There is yet another advantage in this ruling.
Relatives are often together, and in each other's way.
It is impossible that they should not occasionally fall out and if we were to believe their evidence against each other. Perhaps prompted by the anger of the moment, they would betake themselves to the judge who would be off with their heads to the king. But when his anger subsided the relative would want to hang himself for what he had caused his kinsman. All the ways of the Lord are upright. Nevertheless the two passages we have qouted from Kings and Chronicles respectively that describe Amaziah's conduct would seem to contradict our Sages' explanation of our text.