Every Mac comes with an (undocumented) family member classifier

Eighth Rank reports that macOS 26 runs two daemons, knowledgeconstructiond and intelligenceplatformd, that build an on-device knowledge graph from Contacts, Calendar, Photos, Family Sharing, communication logs and location. It is stored in plaintext SQLite under Full Disk Access protection, with 181 entity classes and 278 predicates, including inferred family relationships. The man page is nearly the only Apple documentation, and the mechanism mapping is the authors' inference. Most specific figures, including the family classifier details, lack independent sourcing. Developers should note the privacy exposure if that store is compromised.