Is it permissible for women to visit graves, or is it not permissible based on the claim that the deceased see the living as naked?

The reason women are forbidden from visiting graves is the saying of the Prophet, peace and blessings be upon him: "Allah has cursed women who visit graves," and not because the deceased see visitors naked. The questioner should urge his mother and sister to pray for their deceased father, as supplication is of the greatest benefit to the deceased and reaches him from anywhere.