Teaching Google Now your Relationships
Normally, when telling Google Now to communicate with someone in your phone or tablet you speak the person's full name so that Google Now knows exactly who you mean. At times, speaking full names to Google Now can feel unnatural. To avoid this, you can teach Google Now the relationship between you and a contact stored in your phone.
For example, if Jimmy Hale wanted Google Now to make a phone call to his brother, Timmy Hale, he could say: "Ok Google! Please call Timmy Hale." Google Now 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 Google Now that Timmy Hale is your brother, you can call him by saying "Ok Google! Call my brother."