What is the ruling on wearing the niqab and the ruling on wearing the hijab in front of the step-mother's brothers?

Scholars have differed regarding the permissibility for a woman to uncover her face in front of non-mahram men when there is no fear of temptation (fitna). If you follow the opinion that mandates covering the face from non-mahram men—which is the preferred view with us—then it is not permissible for you to uncover your face in front of your stepfather's brothers, as they are non-mahram. However, if you believe in the permissibility of uncovering the face when there is no fear of temptation, then there is no objection to you uncovering your face in front of them, as long as temptation is safeguarded against.