A marriage is not valid without the wali of the woman. If her proper Wali appoints someone trustworthy to represent him, this is permissible.

Is it allowed in Islam to have a waliyu{my brother) represatative on my Nikah ceremony because he could not make it for some reasons.?

Fiqh of Marriage | October 7, 2015 2:59 am
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I have a friend who is new revert to Islam, he wants to know if he is allowed to marry the widow of his paternal uncle who is also a muslim.
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Can I marry a brother without my Wali, out of fear, my father will do Sihr on me. This father has never known me since I was a toddler, severely!!! neglected me and did a lot of sihr on the rest of my family especially my mother to kill her, together with his wife, and makes no effort to know me (he has my number). I’m 22