What is the ruling on dealing with a father who commits indecency, and is his son obligated to visit him and assist him financially?

The mere fact that the father goes to court does not indicate that he has committed adultery, and the wife should stop searching for hidden faults. There is no objection to the son supporting his father financially as long as he does not know that he will spend it on unlawful things. He should advise his father kindly and strive to improve his condition, and if his wife does not keep him chaste, then he should marry him to another woman or to a second wife.