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I am having problems with my sister in law just dont want to deal with it anymore and its breaking our marriage apart, ever since i been with my husband she just try to break us up or she saids the most hurtful things and lied about things i never said, she is 26 and just broke up with her husband and just got 3 kids and is going out with my husband best friend who has turn againest me because of her, its like everything i say she turns in to a bad fight, or lies about what i say, and if i say things she doesnt want to hear she gets the shits, i just cant cope with it anymore what should i do, does she need help or she just spoilt little child??