my sister suffering from schizophrenia for the last 10 years?

You need to be understanding , she has a mental condition which has no cure , but it has treatment , you can't blame her for that , you could have developed it , but no it happened with her , so you have the job to take care of her whenever she needs, it's your responsability as a sister , about your stress then you need to see a doctor or something , but don't blame her

This is a problem faced by many families in India. The family members are deprived of social mingling and there is a constant dread of what will happen at home any moment. Unlike the other countries we do not have institutions which take care of such victims of schizophrenia. No, Vasantha, don't try to fix her marriage. It is really very difficult for anybody to accept her as their responsibility. Your father dies a unhappy man and I surely understand your mother's unhappiness in the matter. You and your brother are victims of circumstances beyond your control. It is not a curable disease and you should try to admit her in an institution if available or an ashram where such cases are taken care of. There is still time for you to get married and your brother as well. You have to convince your mother to agree to send her someplace where she can spend the rest of her life. Wonder why God does not create everybody equal and normal. With her around, and after your mother's demise, God forbid, your husband or your brothers wife will not agree to keep her at home. Talk to some women's organization and they will help you in the matter. It is better you start acting immediately to spend the rest of your life normally and peacefully. There is a solution for everything.

Not always an easy answer for this one. I hope she can get some help.