Teaching Siri your Relationships
Normally, when telling Siri to communicate with someone in your iPhone or iPad you speak the person's full name so that Siri knows exactly who you mean. At times, speaking full names to Siri can feel unnatural. To avoid this, you can teach Siri the relationship between you and a contact stored in your phone.
For example, if Jimmy Hale wanted Siri to make a phone call to his brother, Timmy Hale, he could say: "Hey Siri! Please call Timmy Hale." Siri would automatically search through Jimmy's contacts for the name "Timmy Hale" and call the phone number associated with the contact. But if you teach Siri that Timmy Hale is your brother, you can call him by saying "Hey Siri! Call my brother."
To set up contact relationships like Timmy Hale as Jimmy Hale's brother with Siri, open the Settings app on your Apple device. Tap General then tap Siri to open the Siri settings screen.
Tap "My Info" and select your own contact information to allow Siri to know who you are in your contacts list.
Now you can give Siri a voice command specifying a relationship between you and an existing contact, such as "Timmy Hale is my brother." Siri will now recognize "brother" as Timmy Hale.
You can even teach Siri custom relationships. So you could teach Siri that someone in your phone was your Boss, Plumber, or Doctor.