No, you do not.   It is not necessary to have detailed knowledge of your family history to participate in family constellation sessions. I will guide you through the process of uncovering and exploring any issues that may be related to your family history. However, having some basic information about your family and their experiences can be helpful in understanding how they may be impacting your emotional and psychological well-being.   During the session, I may ask you about your family history and any specific issues or concerns you may have. I will use representatives/figurines or other objects to represent different family members and help you connect with them emotionally.    All the information we need is within you and emerges through the representatives or figurines, who connect with your family field during this process.   You also do not need to know your relative, in case you had never met them (i.e. your birth parents).