What is the fate of a father who sends a lot of money to his divorced sister with children, at the expense of his wife and son, and insults his wife despite her patience and frugality?

This father mixed a good deed with a bad one. His help to his sister and her children is a good deed for which he will be rewarded. However, if this comes at the expense of the rights of his wife and children, then it is a sin and a betrayal of trust, for the Prophet, peace and blessings be upon him, said: "It is sufficient sin for a man to neglect those whom he supports." His harming of his wife is also a sin. His fate depends on his repentance and the forgiveness of those whose rights he violated. As for the patient mother, she will have abundant goodness and great reward from Allah.