What is meant by mutual imprecation (tula’un), how is it performed, is a father expelling his son considered mutual imprecation, can a mother engage in mutual imprecation with her daughter, and is mutual imprecation permissible in Islamic law?

"Al-Tala'un" is "al-Li'an" (mutual imprecation), and linguistically it means expulsion and banishment from goodness. Religiously, it is defined as testimonies exchanged between a husband and wife when the husband accuses his wife of adultery, these testimonies being affirmed by oaths. The process of Li'an begins with the Imam (leader) starting with the husband, who testifies four times that he is truthful in his accusation of her committing adultery. Then, for the fifth time, he says: "And indeed, the curse of Allah be upon me if I am among the liars." Then the wife testifies four times that her husband is a liar in what he accused her of. Then, for the fifth time, she says: "And indeed, the wrath of Allah be upon me if my husband is among the truthful." As for a father or mother disowning their children, it is not called Li'an in the religious sense.