Case. One partner’s mother regularly interferes: how to run the home, how to raise kids, where to spend.
Model. An external node with excessive rights writes to your system directly. You need a firewall — but a respectful one.
Protocol. The boundary is drawn by the “own” child to their parent, not by the spouse. A single calm response: “Thanks, we’ll decide ourselves.”
Lesson. Perimeter defense is not a rupture with relatives but a filtering rule.
See Perimeter defense.