<human>: Condense the text into a few key points

My mother has mental health issues, has all her life. We suspect she is borderline psychotic, but she refuses to see a psychiatrist. She does, however, manage to get prescriptions for xanax, oxycodone, and whatever else she can get her hands on. She steals my sister's alcohol and gets drunk on it. 

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She's run up on a curb, busting a car tire, forgot about kids she was watching, etc. Lately, it's been escalating. She nearly burnt down the house when she passed out after putting something on the stove. She drove to the store and over to my house the other night, and she was reeking of alcohol. 

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My sister and her kids live in her house. She watches my sister's kids. My sister refuses to move out or consider anything drastic, but I am seriously concerned for their (and my mother's) safety. What are my options?
<bot>: My mother's become a danger to herself and others through her mental health problems and substance abuse. What can I do?