Whether it's your significant other's sister or his brother's wife, sisters-in-law can be a force to be reckoned with. Especially when she's hell-bent on making you miserable.
The most common cause of issues with a sister-in-law is jealousy. Yep, that's right! The green-eyed monster is usually a cause of why she's acting out against you. It may be that she feels threatened by the relationship you have with your spouse, which is usually the case if it's your husband's sister. Because you're a threat to a valued bond, she will do anything to protect that bond by making your life miserable.
Sisters-in-law can be nasty for reasons we may never understand
Maybe she is the kind of person who wants all the attention to herself and cannot stand it now that she has to share her spotlight. Maybe she feels like you're stealing her limelight when your inlaws, friends or spouse praise you or give you some attention. The important thing to remember is that the issue lies with her and not with you.
Grin and bear it
The best strategy is to take away their power. Do not allow your sister-in-law to interfere with your marriage, learn how to play the game and kill her with kindness. Smile at her every chance you get and just be civil and kind. It costs nothing and you end up being the bigger person. A cruel sister-in-law can't defend herself against unexplained kindness.
Kill her with kindness
Perhaps she ignores you when you talk, makes negative comments about you or gossips about you any chance she gets. Smile because she can't get to you. After all, why should you have to change who you are just to help her with her insecurities? Being cheerful every chance you get and show your sister-in-law that, no matter what she says or does - it won't have an effect on you. This will drive her insane!
The truth will set you free
If she's spreading awful rumours, still kill her with kindness - the truth will eventually come to light and when it does you won't be the one with egg on your face. The last thing you want to do is give in to her poisonous behaviour and cause a rift in the family.
Think of dealing with your sister-in-law as a game of chess
You can only control your pieces, how they move in relation to your opponents movements and what happens to them. Once she sees that her attempts are futile she'll be forced to give up. She will finally realise that not all the cruelty in the world could take you down. Continue to maintain your dignity and continue to be the type of woman who made her feel so insecure in the first place.
It really is that simple. Nothing your sister-in-law says or does should be able to upset you, but only you can make the change. Once your sister-in-law realises she can't win, then it's check mate.