[1] It is mainly the brothers of the husband or the in-laws of the wife who are meant here, are only those who could have married that woman if she had not been married.

[2] The stay of a relative of a married woman in seclusion with her may cause great disadvantage and lead to illegal sexual intercourse that would ruin the family. Therefore the Prophet (ﷺ) compared the brother-in-law of a wife to death if he stays in seclusion with her.