Is it permissible for a son to perform the ritual washing (ghusl) of his deceased mother?

It is not permissible for a son to wash his deceased mother unless there is an extreme necessity, such as the absence of a woman to wash her. In such a case, he washes her over her clothes, ensuring he does not look at her body or touch it directly with his hand. Instead, he wraps a thick cloth around his hand. Some jurists have permitted a mahram to wash his mahram woman when necessary, by pouring water over her and her clothes.