In the fourth session the husband says, in the flat voice of a man reporting weather, that she is different. She has started saying what she wants for dinner. She has stopped apologizing on his behalf to his mother. She sits a little straighter at the table. He does not call this a complaint, exactly. He says he doesn't know where the old one went, and the room goes quiet the way a room does when a load-bearing wall has been mentioned.
Systems therapists know the pull. A family is an arrangement that prefers to stay arranged, and when one member shifts, the others feel it as a loss of position and press back, often with real love. Murray Bowen called the counterweight differentiation, the ability to hold a position of one's own while staying connected, and treated it as a central developmental aim. Structural and attachment focused approaches come at the same ground from other directions, through boundaries and roles in the first case and the bond and emotional responsiveness in the second.
The path is worked by one person alone. It asks for no partner, no witness, no conversation with a family member, and it requires no return to a relationship. It works on the roles a person adopted, the Relationships mask in the pair and the Roles mask in the family, and on which of those roles are hers and which were assigned. In that sense it supports differentiation from the individual side, and it does so without sending a client into the system with a new demand.
The caution is the one you already know. A member who begins to change may be met with pressure, and if you did not know the work was under way, you may mistake the pressure for the cause. Ask clients whether they are doing any work of this kind, and ask the couple whether they want to talk about it in session. The decision to share is the client's, and the timing belongs to you.
Safety comes first. Where there is coercion, control, or fear of a partner, identity work on a schedule the partner cannot see is a matter for careful clinical judgment, and the path does not treat relational abuse. Its printed pieces carry a safety paragraph for anyone frightened of or controlled by a person in their life, and a systems clinician will know better than any program when that paragraph applies.
The one page brief sets the systemic frame beside the path and lists the points of fit.