Thoughts of self-harm or suicide can be a mental health emergency that may require immediate medical/psychiatric attention. In an emergency, call 000 or go to your local hospital emergency department, which can refer you to a mental health and/or drug and alcohol service.
If a family member is feeling suicidal, it's important to show them you are concerned, and have an understanding of their situation. It is helpful to avoid; arguing, lecturing, advice giving, or telling them to "forget about it".
Speak to a health professional who understands the complexity of the situation and can direct you to crisis assistance if necessary. For example, you could call a 24-hour helpline, such as Lifeline (13 11 44) or NSW Mental Health Line (1800 011 511), see a GP, or contact mental health services in your area to discuss your concerns.