Is it permissible for a husband to prevent his wife, who lives in Germany, from learning the German language, which she needs to fulfill her needs and the needs of their children, preferring to spend money on his brothers or the poor, knowing that she is the one who earns the salary that he takes from her?

A wife's salary is her exclusive right, and she is not obligated to spend from it on the house, the children, or even herself. The husband alone is responsible for maintenance. It is not permissible for the husband to object to his wife learning a foreign language if she will spend from her own money, unless this is accompanied by a forbidden act such as intermingling or being in seclusion with men. There is no blame on the husband for taking his children's salaries to spend on them, as they are under his guardianship, and the maintenance would then be from their own private money.