Setting up one's family as part of a systemic structural constellation means actually setting up the members of the family in one room.
Strangers act as their deputies. These are placed in the room in accordance with his perceived, inner image of his family. Position in space, feelings, etc. already indicate how the subliminal relationships in the family are.
Systemic Family Constellation depicts the entire family system and the hidden entanglements between its members. But the constellation image also develops a dynamic of its own, because the proxies gain access to the feelings and feelings of the people they represent and they express these feelings, they reproduce the problematic patterns typical of families.