Yes i understand what you're going through. Paranoid schizophrenia is one of the most difficult things to deal with. I reckon it could be even more emotionally draining than a physical illness itself.
My sister is diagnosed with schizophrenia 8 years ago, but she had a relapse after her divorce and refusing to continue medication about a year ago. She thinks that a couple of family members are out to harm her, especially me. She has called the police to arrest me 2 weeks back, and has filed a court order against an 84 year old aunt last month. The court hearing is this week. She has recently been warded for professional treatment, but we still have lots to deal with, and hopefully get the case dismissed. My mum just passed on, and she is accusing me of killing her now. It's very sad because we love her very much, and we have never been nasty towards her.
We have to understand that her perceptions aren't really coming from the person suffering from it. I realise that the more we try to correct her perceptions about things, the more anger is built up against us. It is hard but we have to try not to disagree with them but to try see it from their point of view. Conversations are best kept to an abstract level, without exactly agreeing or disagreeing with the person. Cheeriness helps too, as they are often sensitive and would interpret any signs otherwise as negative.
Please stay strong and take good care.