Boy, 4, Uses Siri To Help Save Mum's Life (bbc.com)
A four-year-old boy saved his mother's life by using her thumb to unlock her iPhone and then asking it to call 999. From a report: Roman, who lives in Kenley, Croydon, south London, used the phone's voice control -- Siri -- to call emergency services. Police and paramedics were sent to the home and were able to give live-saving first aid to his mother.
UK (and some other parts of the world) slang for mother is Mum...