Firstly, you need to handle this matter very carefully. You can’t react aggressively and mindlessly. Try to listen to your wife’s point of view. Don’t be judgmental and listen to her calmly. You should try to know why she is feeling like that. There might be chances that she is wrong but maybe she has some points. Don’t think like a son to your father but as a husband to your wife. You need to listen to the whole story and then conclude with a point. Try not to be biased and unfair. And if you find any truth in her story then try to talk to your father. Ask him to give a proper explanation for his actions.