How to add a contact brother or sister?

Select a contact, edit and in the name box you will see a + sign.

If adding in inner circle, just click on the name and there will be three boxes. Write the nickname there.
 
Select a contact, edit and in the name box you will see a + sign.

If adding in inner circle, just click on the name and there will be three boxes. Write the nickname there.
The nick name itself is the relationship thing ehhh ....thanks will try it out ...