Is it permissible for a stepfather

A: If a more distant Waliy concludes the marriage contract of the woman in the presence of the closest Waliy without a legal excuse or a will made by the closest Waliy, this contract will be Batil (null and void). The marriage will be invalid in this case because he has no authority over the woman in the presence of her closest Waliy. However, the closest Waliy has the right to (Part No. 18; Page No. 175) abdicate Wilayah (legal accountability to act for a woman seeking marriage) to the next Waliy or authorize another competent Waliy to conclude the marriage. In this case, the contract and the marriage will be valid because he abdicates his right to the person whom he authorizes, so he takes his entire rights. Accordingly, it is permissible for a brother to conclude the contract of his sister if the closest Waliy authorizes him to do so. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.