What was the family relationship between Hazrat Umar and Hazrat ali ?

Re: What was the family relationship between Hazrat Umar and Hazrat ali ?

I am not talking about the Sunni traditions which say that such and such person got married to such and such lady. I am referring to those Sunni reports that talks about the marriage in detail i.e. starting from the proposal. You cannot escapte that and bring traditions of your own choice.