It is 2025. I have a contacts card for me, which is marked as me, and one for my son, which is marked as being my son. Both of our full names are present. I have photos in the Photos app with a Person defined for my son and hundreds of thus-categorised photos, under the same name.

Siri still cannot show me photos of "my son", or of (my son's full name). Every time there's an OS update, like yesterday, my wife and I re-test this simple request and laugh at the failure.