Sein Sohn

\"Sein Sohn\" (His son) is not a specific individual identifiable in UAP/UFO research, military, or government programs based on available sources. It appears as a common German phrase in biographical contexts, such as references to family members of key figures. For example, J. Allen Hynek (1910-1986), American astronomer and UFO consultant to US Air Force Projects Sign, Grudge, and Blue Book, had a son Joel who worked as a special effects developer, but no direct UAP involvement. Jacques Vallée (b. 1939), French-American ufologist, has two children, unnamed in sources, with his career focused on interdimensional hypotheses and books like 'Passport to Magonia'. No primary role, achievements, publications, or testimony attributed to any \"Sein Sohn\" in the field.