My Mother's Delusions

My gran put my Mum through hell when she was young not because she was evil but through mental illness. Now my gran is back staying at our home and my family has fallen apart. I am writing at a crucial point in my Mums mental illness. I have now for five days suffered listening to my mums delusions. My mum thinks that her son and my dad and her husband have spiked her and are plotting to kill her. She also thinks she has broke national security and is being spied on. At these times in my life I see no light at the end of the tunnel. As my gran after all these years at 82 still suffers these delusions its a scary thing to witness and I just don't know how to cope as I am only a 17 year old. I've thought about moving out or running away but my mum did that with my gran and look were she ended up. I just feel like curling up and dying but I hope she gets better and at the end of the day I love her for whoever she is.