What this placement means
Mars in the 4th astrological house activates the defense of the private base: home, coexistence, memory and conditions to let down the guard. It does not describe a violent family or force people to cut ties. Your own question is what rule protects your privacy without turning every difference into an inherited battle.
A base that can be inhabited
Deciding who enters your space, what task corresponds to each person or what conversation needs a schedule are concrete actions. Before responding out of anger, I distinguished a current need from an old scene that is repeating itself. A brief limit can be more caring than an endless explanation.
Protecting the house also means being able to repair: recognizing the impact of a response, changing a rule, and talking again when things are calm. Mars does not need to win to build security.
The axis with the 10th house
The 10th astrological house reminds us that public life needs a foundation that is not always available. I defined what part of the work or exhibition ends when the door closes. Sustainable ambition includes a place where you don't have to take an exam.
What to review in your chart
The sign of Mars shows the way to defend and act intimately; the ruling planet of the astrological 4th house and its aspects add context. Also review the astrological 10th house, the astrological house system and the quality of the natal time. This position does not diagnose violence or predict family breakups.
Choose a recent coexistence rule, write down what it protects and negotiate a specific modification. Then explore Mars in your chart with reliable birth data.