Is it permissible for a woman who vowed to donate her jewelry as charity to donate it to her brothers?

The basic principle regarding a vow to give charity, without specifying a recipient, is that it should be given to the poor and the needy. Among them, the poor relatives of the one who made the vow have a greater right to it than others. Therefore, if the brothers are poor, it is permissible to give them the jewelry, unless the questioner had intended to give the charity to specific poor individuals.