So, here's the story... and I really could use some advice, because I don't know what to do.

My sister called me yesterday and said she had talked to my husband's step mother in the store... my sister said that the stepmother said a TON of awful things about me and my husband. I mean they were AWFUL things she accused her of saying. Needless to say, my husband and I were angry and also hurt when we heard about this.

So, we decided that we would no longer have any contact with my husband's father and stepmother. It really devastated us to think that she would say these things about us. But then I sat and thought about it for awhile, and I realized that it was totally not like the stepmother to do something like that. She's never, ever said anything bad or hateful to me or about me in the 12 years that I've been with my husband. So, it just seemed unlike her to do somethig like that.

After I told my husband that I thought something was a little fishy about the whole thing, we decided to call his father and stepmother and ask about it. She was SHOCKED. She broke down in tears and swore to me that it never happened and that she would go and confront my sister with me if she needed to prove that she never said any of the things my sister accused her of saying.

My husband and I both completely believe the stepmother, and know for a fact that my sister is lying.

Now, here's where it gets sticky. My sister lives with my parents along with her 4 children. I want to confront my sister with this, but I know if I do that it will be a big argument with my parents as well... because I mentioned something about it to my mother this morning and she said that she totally believes my sister because she has no reason to lie. My parents stand behind her on ANYTHING. I would be asking for a heap of trouble from them if I confront my sister with this terrible lie she told.

A little background on my sister and the reason why she may be behaving like this... She's currently addicted to hydrocodone... she takes them up to 10 at a time... she is starting to mess with cocaine also. She's an addict.. plain and simple. I'm not making excuses for her behavior, but I believe this plays a role in why she's acting like this. She has recently stolen checks from my mother and my grandmother and cashed them to get money for her drugs. She's also stolen jewelry and other things of value from my mother.

My parents still back her up and stick beside her no matter what...so, this is my question.

Do I confront her about the lies she told that could have possibly torn my husband's relationship with his father and stepmother to shreds, or do I just let it go to avoid the massive argument it would cause between me and my parents?

Sorry this is so long... but I NEED some advice... please.