Is it permissible for the husband, Islamically, to complain to his wife's mother or to threaten to complain to her as a means of pressure, especially if solving the problem is possible between the spouses without external interference?

The marital relationship is built upon affection and good companionship, and it requires patience, overlooking faults, and focusing on the good aspects. The Messenger of Allah, peace and blessings be upon him, said: "Let no believing man hate a believing woman; if he dislikes one of her characteristics, he will be pleased with another." The basic principle is for the spouses to resolve their disagreements between themselves without outside intervention. However, if understanding becomes difficult, there is no harm in the intervention of a conciliator. If the husband complains to the wife's mother when understanding is difficult, there is no harm. But if he does so as a threat and without need, then it is a sign of poor companionship. The wife should avoid the causes of conflict, engage in dialogue with politeness and gentleness, and not neglect the rights of her husband, while seeking assistance from Allah and making supplication.