Clinical Psychologist, Psychologist
When a family member suffers from depression, it affects the whole family. When suicidal ideation is a factor, the pressure on everybody can be enormous. Therefore, supporting your mother is equally important as supporting your sister because she is carrying a heavy load.
You cannot help your sister with her depression per se. She needs to consult with mental health professionals such as a psychiatrist and a clinical psychologist.
What she needs from you is to understand what depression is, and what she is going through. I am often told by my patients that they feel criticised when family members tell them to
When you understand how awful depressive symptoms are, how desperate your sister feels and how she cannot simply snap out of it, she will feel supported.
You could also keep abreast of the latest developments, and share them with her, ensuring that she is receiving the best treatment possible.
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