Is it permissible for a wife to give charity from her husband's money on behalf of her deceased father, with or without his knowledge and permission? And is it permissible for her to give charity from his money on behalf of his deceased parents?

The wife is entrusted with her husband's wealth and is responsible for it. It is not permissible for her to spend anything from his household except with his permission.

If he permits her to give charity from his money on behalf of her father or others, there is no harm in that.

The majority of scholars are of the view that it is not permissible for her to spend anything from his money in charity or otherwise if he has not given her permission.

Some scholars are of the view that it is permissible to give a small amount of the husband's money in charity, based on the hadith of Aisha (may Allah be pleased with her): "When a woman gives in charity from her husband's food without causing damage, she will have her reward, and her husband will have his reward for what he earned, and the keeper will have a similar reward."