Sounds like the drugs have made them schizophrenic. They need to get some PROFESSIONAL help.
I used to get phone calls at work from a guy I used to work with, who thought he had been implanted with a micro-chip, that the government had his phone and computer tapped, that agents of the government were following him around, agents of the government were having his neighbor's try to "set him off" so they could arrest him, that President Bush was speaking to him directly thru the t.v. whenever he gave any type of televised address.
He would go off on these rambling tirades that were so disconnected, you would have to hear them to believe them.
Mis, it looks like you will not be able to do much for them, so don't feel guilty, and don't let them destroy YOUR life.
I really don't want to sound like a hard-ass on this, but I used to warn my daughter that one of the possible consequences of trying drugs are: You might love the drugs you try, and become addicted..............for life.
Warlock