My Cousin Is 52 Years Old. She Drinks 2 1.75

my cousin is 52 years old. she drinks 2 1.75 litres of vodka every six days or so. Her mother had Parkinsons. She has been having what looks like seizures to me in the the last few weeks. She will just get dizzy and start shaking uncontrollably. Her whole body trembles. She moves slowly. She does nothing but sleep, watch TV and drink vodka. I am trying to help her but she is hard to handle. I am afraid there is something really wrong with her. Any clues as to what to tell her kids to get them to intervene would be helpful. I am already a caretaker of a man with CP and this is getting to be too much. I am also 52 years old.