What is the ruling on one who swore by divorce upon his wife that he would not enter his father's house, then entered the house for his sister's wedding, knowing that he was angry and did not know whether he intended the oath or the divorce?

The oath and divorce of an angry person are valid if he is aware of what he is saying. However, if he loses his mind, divorce is not binding on him. Disobeying and abandoning parents is a heinous sin, and the son must reconcile with his father and treat him kindly.