A man shall leave his mother and father and cling to his wife. In sickness and in health. If you people dissolve the marriage does it change the fact that she bore kids and will always be a part of their lives. For the sake of the kids, do not abandon simply because her family have done the same. Although it's unfair for her or her family to hide her mental issues if indeed they have truly existed and they were aware before marriage but then she is a part of the family and the union is blessed with 3 healthy children. I'd ask that you people ask your brother to confront her family and if they admit it then tell them that they'd need to intensify efforts to make her better just as your family is trying. I actually assumed it was post partum psychosis when you said it started after her 3rd child because some women get mentally depressed after a baby. Deliverance isn't bad but mental disorder is not always spiritual. She needs a counselor and psychiatrist, it would be unfair to make her pay for something that isn't her fault. She might also have thought she was better reason she didn't tell your brother. This is why it's very good to make proper enquiries about someone you want to marry and their family.
