The hatred of persons related to each other is the most violent.

Quarrels within a family run hotter than any other kind. There is more history to draw on, the wounds are older, and neither side can walk away and become strangers, so every disagreement carries the weight of the ones before it. What would be a minor slight from a colleague arrives from a sibling as a continuation.

If you are in one of these, the useful move is to shrink the field rather than to win it. Deal with the thing that actually happened this month and leave the archive closed. And where the distance has become permanent, it is allowed to be a loss you carry rather than a problem to solve.