Can the curses and insults directed by a father at his family, including his cursing the mother's religion and his imprecations against the mother's maternal uncles and grandmother, come true?

If the father curses the religion, his action is extremely dangerous, for cursing religion is one of the causes of disbelief and apostasy from Islam. As for cursing and damning people, it is not characteristic of a believer, and its perpetrator incurs sin, and the curse may return upon its utterer. It is obligatory to advise the father and invite him to repentance, to involve righteous people to influence him, to pray for his guidance, and to avoid provoking him. It is hoped that his دعاء of cursing will not be answered if it is without a just cause; for a condition for the acceptance of supplication is that it does not involve sin or the severing of kinship ties.