What is the ruling on the actions taken by the wife, her mother, and her siblings, after all that the husband spent on her? And does the husband deserve this harsh treatment?

A wife's salary is her right, and her husband has no share in it except what she gives him willingly. The covenant between you regarding the preservation of her money for her and for her children must be fulfilled, and it is not permissible for her to break it; if she breaks it, she is sinful. A wife's request for khulʿ (divorce at her initiative) without cause is not permissible, based on the Prophet's (peace be upon him) saying: "Any woman who asks her husband for divorce without any strong reason, the scent of Paradise will be forbidden to her." If you claim an increase in the true mahr (dowry) beyond what is registered, you must prove it with evidence. Inciting a wife's family to encourage her disobedience and rebellion is forbidden and considered a prohibited act of corrupting. If the furniture taken by the wife is rightfully hers, there is no blame on her. You are obligated to remind your wife of God and of the sin of breaking covenants and destroying the family without cause. If she does not respond, then entrust your affair to God.