Is it permissible to give Zakat to my wife's brother for him to pay off his debts and marriage expenses, knowing that he works and receives a good salary?

It is permissible to give zakat to the wife's brother if he is needy and in debt, as he falls under the categories of those in debt (al-gharimin) and those in need of marriage, provided that his salary is insufficient, and that he is given only what he needs, without extravagance in wedding luxuries.