Suggestions as how to end the estrangement between disputing relatives
Question

                My Uncle has told my mother that he doesn't want to see our family ever again. What is our duty in  this position considering we did nothing to upset him or his family?
Praise be to Allah.You have to look for the reason, for it is not normal
      for something like this to happen without a reason, but that reason may be
      unknown to you. If you did not do anything deliberate to upset him, then
      do not feel responsible for what has happened and for his cutting off ties
      with you. You have to be patient and treat him well even if he mistreats
      you. Perhaps he will come back to you when he sees your good attitude.
 In
      many cases, this kind of rigid and harsh-hearted attitude is temporary and
      does not last for long; it may stem from a particular incident which made
      the person angry, but when his anger has calmed down and some time has
      passed, things go back to the way they were, or close enough. Perhaps some
      extreme circumstances coincided with a bad attitude, hatred or an
      inclination to bear grudges, which resulted in a long-term estrangement.
      In this case all parties concerned should be given time to calm down
      gradually, so that the bad feelings may be reduced; at the same time, the
      person who has cut off ties of kinship should be reminded of the rights of
      his relatives, what Allaah and His Messenger say on this matter, and the
      stern warning issued to those who cut off ties of kinship. If any of the
      parties involved have been wronged, things must be put right as quickly as
      possible, and there is nothing wrong with tryingto heal the wounded pride of theparty that has been wronged, by apologizing or getting together for
      the purpose of reconciliation, etc., as Allaah says (interpretation of the
      meaning):
“and
      adjust all matters of difference among you” [al-Anfaal 8:1].
We hope that
      the one who undertakes to reconcile between them will earn the reward
      mentioned in the aayah (interpretation of the meaning);
“There is
      no good in most of their secret talks save (in) him who orders Sadaqah
      (charity in Allaah’s Cause), or Ma‘roof (Islamic Monotheism and all
      the good and righteous deeds which
      Allaah has ordained), or conciliation between mankind; and he who does
      this, seeking the good Pleasure of Allaah, We shall give him a great
      reward” [al-Nisaa’ 4:114]
 Sometimes
      it may be better to avoid getting involved in looking for a reconciliation
      until things have calmed down and people are more likely to agree to open
      the issue and listen to those who want to reconcile between them and
      accept their suggestions.
 We
      ask Allaah for guidance.