If you add your relationship with a contact on iPhone, then you'll have easier communication with him/her using Siri. For instance, you can say "Call Mom" or "Send an Email to my Brother". To add relationships to contacts on iPhone, do as follows:
1. Open the Contacts app on your iPhone (Open the Phone app and go to the Contacts tab)
2. Look for name as the Owner and open it
3. Tap the Edit button on the top right of the screen
3. Scroll down to the middle and find the Add Related Name option
4. Tap on it, and specify the relationship you are going to define. For example select the Father label and then on then find your Father in the contacts and assign it to the Father label
5. Hit the Done button and you are all set
6. From now on, to communicate with your father using Siri, you just need to say: "Hey Siri! Send and email to My Father"
Tip: If you find this process (define a person as one of your related) hard do to, you may use some tricks. Open the Siri, and tell her to "Call your Sister". Since you haven't added anyone as your Sister yet, then Siri will ask you who you want to define as your Sister? And then you can simply tell Siri who your sister is.
Tip: If you find this process (define a person as one of your related) hard do to, you may use some tricks. Open the Siri, and tell her to "Call your Sister". Since you haven't added anyone as your Sister yet, then Siri will ask you who you want to define as your Sister? And then you can simply tell Siri who your sister is.