What do you do when your family is falling apart...

I'd leave.

Seriously. You've done all you can for your loved ones, but they're fucking with you now. They're taking your help for granted. They're only going to continue to lie to you.

Worry about yourself, now. It seems your personal well-being is going down the shitter with your family. I'm all about helping people in times of need, but not at the consequence of my own health. There's only so much you can do.

Get out. Go live with your Dad or something - he sounds like he has a good head on his shoulders.

Those two broads are going to need to learn the hard way how to take care of their addictions, bad spending habits, and living conditions. They both need to see someone. I would mention it to them upon leaving. "When you guys get help, I'll consider coming back" or whatever, provided you can avoid being an enabler in the future.

Jam it back in, in the dark.