What is the religious ruling on a husband saying to his wife's uncle: "Come and take your daughter... your daughter is divorced"?

Your statement to your wife, "Your daughter is divorced," results in one divorce, whether the wife is present or absent. If this was not the third divorce, you have the right to reconcile with her before her waiting period (iddah (definition)) ends. It is advisable to strive to avoid marital disputes and to seek wisdom in resolving them, while establishing foundations for understanding between the spouses to ensure family stability, and for each of them to know and fulfill the rights of the other.