All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
Regardless of the tribe, country or lineage, religiousness is the criteria for suitability in marriage. When the woman’s guardian prevents her from marrying a suitable person, she can bring her issue before the Sharee’ah (Islamic law) court. Nevertheless, you are not entitled to this unless she authorizes you to plead on her behalf before the court.
We advise you not to do so in order to avoid problems and dispute. You should seek help from people whom you think are able to persuade the girl’s father and brothers. Otherwise, you can find another girl, for this is may be better.
Allaah Knows best.