Every Mac comes with an (undocumented) family member classifier

Automated excerpt

Beside it, in tables of their own, sit who appears with whom in your photos; the communication log (who, when, which app, which direction; no content), which also pulls from your other devices; location and movement; and a long tail of device signals (screen locked, Wi-Fi, Bluetooth, charging, ambient light, and a stream named ContextualUnderstanding.PhysicalSocial whose record format lists people by name, phone and email, each with a start and an end time; it reads like a log of who was physically around you, though we never saw it filled in).

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