After our husband has passed away, how should my relationship with my co-wife continue?

The husband's death does not sever the wider family bond that has been formed, especially for the sake of the children, who are siblings. Forgiving each other's old wounds is the most relieving step; Allah says: “let them forgive and overlook” (Surah an-Nur 24:22). Work together on the children's matters and keep up the ties of kinship between them. For matters of the estate and each person's rights, consult the religious affairs office or Amanah Raya so that the distribution is made fairly and correctly. Stepping back from quarrels over property will protect the children's relationships in the long term. Pray for your late husband, and carry on with life with dignity. See co-wife relations.