My father is in stage 2 Parkinson's disease. Recently, he tried to take his life by taking a combination of prescription sleep aid medications - he did not succeed. He has trouble walking, can't sleep, is constipated, has heart disease, urinary problems, etc. Now he is also on anti-depressant medication. He lives with my mother but we see them every day. What can I do to help him? How can I be sure he does not try to take his life again?