Hello
Siri responded to my son and my husband too how can i make it responds only to my voice
iPhone 8 Plus, iOS 13
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Siri does not recognise voices. Even if you keep your iPhone near a TV it will fetch sound and voices from TV and respond with what ever it interprets.
Siri on an iPhone was never designed on an iPhone for recognising voices. When you enable "Hey Sir " it may ask you to say few words and phrases just to understand you better but never to recognise your voice.
Siri uses speech recognition and not voice recognition