Is a son considered disobedient to his father if he expels him from the house after the father asked his son's wife for adultery and beat his granddaughter?

It is impermissible to treat the father in the manner mentioned in the question, because his right to dutifulness (birr) is not forfeited by his iniquity (fisq) or disbelief (kufr). If the wife's account of the father's actions is proven true, the son must advise him and remind him of Allah and His punishment. He must not allow him to enter upon this woman or be in seclusion with her. The son must be dutiful to his father and provide him with housing, either separate or in the house, independent of the wife. He must also arrange his marriage if the father is in need and the son is able to do so.