What is the ruling on moving a deceased person's body more than a year after his burial without the knowledge of his wife and daughters, what is the effect of that on the deceased, what is the ruling on severing ties of kinship because of it, and does the relatives' lack of response to attempts at reconciliation justify the severance?

Exhuming a grave and moving the deceased from it is not permissible except for a valid reason. What your wife's family did by exhuming the grave and removing the deceased from it is forbidden, as it lacks a valid religious purpose. It also causes distress to the family of the deceased and goes against his will. They must repent and seek forgiveness from the family of the deceased. However, it is not permissible to sever ties with them; rather, they should be advised, guided, and warned against repeating such an act.