sister in law from hell!!

Ugh please send me patience as I'm going insane trying to keep the peace and be the bigger person!
Have any of you ever felt that someone so unhappy in their own life try to make your life hell to feel better about themselves? 
Tell me if I'm wrong but when you live with someone whether or not they are family, you need to have mutual respect of boundaries, however you also give respect to get respect, treat others the way you would like to be treated right? I'm really struggling right now not to just flip! 
Any advice would be appreciated and if you want any specifics just ask! 

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