In the context of Amadeus, a "Fake Family" refers to the practice of assigning a to a group of unrelated travelers within a single Passenger Name Record (PNR). This is done to bypass specific system limitations or to streamline the booking process for groups that do not share a last name. Why travel agents use it:

If you were thinking of "fake" in the sense of deepfakes rather than synthetic data, another relevant recent paper is "FakeParts: a New Family of AI-Generated DeepFakes"

To issue tickets, the group needs access to a GDS. They obtain this by: