What is the ruling on a husband intervening to protect his wife's money from being lost, in a situation where her family is procrastinating in returning a sum they borrowed from her in dollars, and they intend to return only half of it, exploiting the collapse of the local currency, and they believe that he has no right to interfere in this matter?

If your wife appoints you as her agent to demand her debt, you are permitted to demand it. However, if she agrees to take part of it and waive the rest, you have no right to demand the remainder, as the right belongs solely to her. If the wife's family incites their daughter to divorce without a legitimate reason, it is a reprehensible act, and she must not obey them. You are permitted to prevent her from visiting them and prevent them from visiting her if you fear their corrupting influence on her.