Ascendants and descendants of the couple acting as witnesses to their marriage

What if her brother is her wali and he entrusts the matter of her marriage to her maternal uncle?

Her father engaged her to him, then her father died and her paternal uncles want to change the agreement

A Christian woman is asking whether her marriage to a Muslim is valid

She stipulated that her husband would not smoke and he did not adhere to the condition

He wants to marry a Christian woman

Does he have to marry his female relative whom he touched in a haraam manner?

Christian Wants to Baptize Son in Church

He had anal intercourse with a foreign woman but they have repented. Is it permissible for them to get married?

They were in a haraam relationship then they repented and got married without a wali (guardian); what should they do now?