Mental condition of mother. Hi, this is!

Hi, This is regarding the mental condition of my mother. She keeps on shouting on my sister,father and on me. She is very paranoid of everything. This is becoming an issue where it is affecting the relationship between within my family members towards her. Earlier with the help of my maternal uncle my mother was diagnosed with a mental condition in Chennai where the Doctor had prescribed her some medicines and had strictly mentioned to continue the medicines till further assessments. Later on she was taking the medicines but the medicines made her very sleepy. Recently my sister had moved in with my mother and father post her college completion. She had stopped talking the medicines because she had mentioned that she is unable to work that's why she has stopped taking the medicines. It has been 2 months that she has stopped taking medicines and this has led to the following symptoms - 1. Unable to sleep at night. 2. Mumbling and shouting unnecessarily. 3. Being paranoid.