What should a committed man do who has been left with the responsibility of caring for his nieces after the death of their husband, when they do not adhere to the legal hijab, and their mother or paternal uncles do not respond to advice? Is he sinful for driving with them in this state, or should he leave them to their own devices and let their mother drive the car, given previous concerns about her?

The Sharia did not specify a particular type of hijab. Rather, scholars mentioned conditions, if met in clothing, would make it a legitimate hijab. It is permissible to accompany your sister and her daughters if they cover their bodies and uncover their faces, in imitation of those who permit this.

If they wear immodest clothing, the questioner should advise them of the obligation to cover, and the guardian of the daughters (their uncle) should compel them to wear hijab to the best of his ability. He is not allowed to permit them to go out adorned [and uncovered].

The questioner must protect his sister and keep her away from places of temptation. He is not allowed to use force with her. However, he is not allowed to leave her to her own devices, especially with the appearance of suspicious activity in phone calls. The father, grandfather, or other male relatives, such as the brother and uncle, have the guardianship right to take in a female relative who is not safe on her own, in order to protect her.

The questioner is advised to seek a righteous husband for his sister. Girls should not be left if there is fear of their going astray. Their riding with the questioner while they are in an unsatisfactory state is lesser of an evil than leaving them entirely, which could expose them to greater corruption.