Does she have to visit the wife of one of her relatives?
Question

                I am a person who fears Allaah – praise be to Allaah – and I hope that you can answer my question, because I am very keen to know whether I have to do something or not, because I fear my Creator.  

There is a woman who is the wife of one of my relatives, and she lives in the same province. As she is the wife of one of our relatives, she is regarded as one of us, but one day she caused a problem. I do not bear any grudge in my heart against her and I wish her well, her and her children and her husband. On every occasion, whether it is a celebration, Eid or a family gathering, I greet her and say salaams to her, but she does not visit me in my home and I do not visit her. Is there any sin on me? Am I regarded as severing ties of kinship? What do you advise me?.
Praise be to Allah.
    I ask Allaah to reward you greatly for your keenness to avoid 
    sin. Allaah, may He be glorified and exalted, loves a pious slave who 
    remembers that He is watching in secret and in the open, and takes stock of 
    himself in all his affairs, and does not rest until he is assured that he 
    has not disobeyed Allaah or earned His wrath. 

    With regard to what you have mentioned about your 
    disagreement with the wife of one of your relatives, you have taken the 
    right first step by greeting her on every occasion. You should complete the 
    good deed by visiting her, even if it is only once, so that there will not 
    be any resentment or grudge left in the heart. By doing this you will cut 
    off a way by which the Shaytaan could reach you. Strive to keep away from 
    anything that could provoke disagreements and arguments between you, because 
    it is not permissible for a Muslim to argue with his brother over trivial 
    worldly matters. It is mustahabb for the one who has been wronged to forgive 
    his brother, so what about a dispute that seems to be about ordinary things? 
     

    The wife of a relative is not a mahram, but upholding ties 
    with this relative – if he is a mahram – includes visiting his wife, asking 
    how she is, and taking an interest in her affairs.  

    In Fataawa al-Lajnah al-Daa’imah it says (26/127): 

    Islam enjoins instilling love among the Muslims. It urges 
    them to love one another, be compassionate towards one another, and uphold 
    ties with one another so that their affairs will be set right, and they will 
    be united against others. Islam warns them against enmity and hatred, and 
    forbids them to forsake one another or cut off ties with one another. 
    Forsaking a person for more than three days is haraam. 

    In al-Saheehayn and elsewhere it is narrated from Abu 
    Ayyoob al-Ansaari (may Allaah be pleased with him) that the Messenger of 
    Allaah  (peace and blessings of Allaah be upon him) said: “It is not 
    permissible for a Muslim to forsake his brother for more than three days, 
    each of them turning away from the other if they meet. The better of them is 
    the one who greets the other first.” 

    In Sunan al-Tirmidhi it is narrated from Abu Hurayrah 
    (may Allaah be pleased with him) that the Messenger of Allaah  (peace 
    and blessings of Allaah be upon him) said: “Beware of conflict, for it is 
    the shaver” i.e., it erases religious commitment. 

    What the Muslim must do if there is a disagreement between 
    him and his brother is to go to him and greet him with salaam, and treat him 
    kindly so as to reconcile between them. There is great reward in that, and 
    avoidance of sin. End quote. 

    Conclusion: you are not regarded as severing family ties 
    because of this, but you should strive to resolve the differences between 
    you. 

    We ask Allaah to set the Muslims’ affairs straight. 
And Allaah knows 
    best.