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 member of your family is feeling suicidal, it's important to show them you are concerned and have an understanding of their situation. You should avoid behaviour such as sermonising, arguing, trying to problem solve, giving advice, 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.