I tried to post this to two different Facebook groups, where posts have to be approved by admins first, and both declined without telling me why. Both groups were geared to families with substance abuse issues, so I have no idea what the issue was. I hope it's OK to post here. I know the situation I'm describing is all over the map, but it concerns someone's unrealistic beliefs. I have to vent this, and I am desperately hoping for support.

PLEASE BE CAREFUL WITH THIS POST. IT CAN BE TRIGGERING.

I lost my 39-year-old daughter this past Christmas Eve to a narcotic overdose, and years ago, a two-month-old baby to SIDS. I have one child left, who I strongly suspect is using as well.

My living child (41, claims nonbinary, uses they/them) is obviously delusional. They insist that neighbors are harassing them by using ventriloquism to make it sound like voices are coming from inside their apartment. They also claim that neighbors have randomly walked by and dropped some kind of experimental substance onto their skin, hair, or clothes. My guess is, it's more likely they're using. I'm so afraid I'm going to lose them too.

My child was just now passionately arguing with me that our entire family is enrolled in some kind of multiple-generation race study. They are also convinced that we are descended from the Maldives (which could be true, I did have a DNA test done and showed a trace of West Asian) but then they are adamant that the Maldives is a landlocked nation within the borders of Nigeria. Claims to have met the King of Nigeria and "King Harmon of the Maldives" as a small child, at which point they learned conversational Nigerian in a day. (They have never been outside the US. Nigeria has been a federal republic since 1963 and doesn't have a king. There has never been a King Harmon of the Maldives. Also, there are several languages spoken in Nigeria, but English is the official, and I don't think there is any one language called "Nigerian.")

My child will not be persuaded that the Maldives is actually an archapelago off the coast of India. Thinks it's some big worldwide consipracy that all of the maps say it is. Also thinks it's a major massive gaslighting coverup that nobody in our family admits to ever being part of any such study. And thinks people are racist against them for being Black, which we are not.

I know it does no good to argue with people having delusions, but I am freaked out because it appears my last living child is on something. And I don't know what to do. They're 41 and don't live with me. I can't make them do anything.