Is the sum of ten thousand riyals, which I stipulated in addition to the dowry for the divorce of my cousin, lawful or unlawful? And did I err in anything I did?

Muslims should be in harmony and affection, especially relatives, for discord is evil and reconciliation is good. The dispute that occurred between the questioner and his maternal uncle regarding marriage is not a grave matter. The most important thing is that it should not lead to severing kinship ties, as this is a defect in religion. It is advisable to be deliberate and strive for reconciliation, for perhaps the non-completion of the marriage is better. The promise to divorce the girl in exchange for your uncle's oath is a promise that does not necessitate fulfillment, and there is no harm upon you in taking compensation for the divorce. The jurists differed on the permissibility of taking an amount exceeding the mahr (dowry) as compensation for khulʿ (a woman seeking divorce by returning the mahr or giving compensation), and the majority of them permit it. It is advised to forget what has passed and open a new page filled with affection and compassion, and to be more tolerant because your uncle is like a father.