What are the husband's rights if his wife and her family refuse her return to him after a long journey, knowing that the husband was aware of her disobedience during his absence? And does he have the right to resort to the police or the court?

If the wife did not stipulate in the marriage contract that she would not leave her country, then she has no right to refuse to move with you. Obedience to the husband in this situation is more obligatory than obedience to her parents. If she refuses to move without a valid excuse, she is considered disobedient (nashiz), and you are permitted to take the matter to court. If reconciliation efforts are unfruitful, you may restrict her until she forfeits some of her rights.