When you marry someone, their whole family becomes your family. In the beginning, as we do not know anyone’s character and motive, we try to talk and like each one equally. But as time passes, you can witness their particular traits of character. A sister in law is one of the closest between a couple. She helps you in your household and becomes your friend. But many times they are not so good as we think. She starts to interfere in your matters or create tension between the couple. For those, here are some of the ways to how to deal with two-faced sister in law. First of all, they have to start on a new day. Do not talk much to her because, as she hears it, she will begin her planning. This is the leading way of dealing with them and also to save you. Remember whatever she says never respond clearly or give your opinion as she may use that against you. Never tell your spouse that you do not like her, as it will create a negative impact on your personality. Do not involve yourself in any of the matters. Try to avoid spending time with her as much you can. Following the above procedures, your sister in law will surely understand that something is wrong. If she is the right person, she will try to improve and will never try to hurt you. In case still, the situation is not under control, visit an expert specialist who can guide you in the matter. You can also consult with your friends who are witnessing the same problem.