siri not remembering WIFE as a relationship

When I ask Siri to remember x as my wife, she adds the same to my info and it shows up correctly, but when I ask her to call my wife, she says Have put this info manually and tried too!! There is no wife number for me.My info under siri is correct and so is the relationship info. When I turn Siri Off n then on it finds my wife number n dials it correctly, but it only does that ONCE Pretty wierd huh! The second time around it again gives me "the same number not found" message. Have configured every thing correctly and am using icloud. If i ask her to call my spouse, only then she finds the correct contact and Dials BUT I WANT TO ADDRESS HER AS MY WIFE.( Have done the labeling correctly too) She even calls my daughter correctly (who is listed as my child in the relationships) Go figure!!! kindly help if u can figure this out...cheers,