The inlaws can make life very difficult between you and your significant other if they so choose. This has been part of my problem. I have lost sleep, cannot eat, and now take anti depressants because of my future sil. She has turned the whole family against me. I do not even know why. She is very dirty and controlling, I guess she just wants both her brothers to her self, her other brother has never reallly been in a relationship and is 47, she would like it if my fiance never had another relationship as well I am sure. She is a scag.