Is it permissible for a wife to use her personal allowance by giving it to her family or donating from it without her husband's permission? And is it permissible for her to use the surplus from the household allowance in the same way without his knowledge?

The default rule is that a wife is entrusted with her husband's money, and it is not permissible for her to dispose of it except with his permission. However, some scholars have held that it is permissible for her to give a small amount in charity without his permission. If a husband gives his wife her maintenance allowance or gifts her money, then she is free to dispose of it as she wishes, such as giving some of it to her family. However, if he gives her money for spending and the remainder is his, then it is not permissible for her to give any of it to her family without his consent.