Helping a bipolar sibling

I'm having a tough time with something. My sister is on a consistent dose of something (im not exactly sure what or how much, but her husband is monitoring)...She's also going to both individual and group therapies...

As far as I know she's stable (not currently manic or depressive.) But she's clearly having some hallucinations regarding people that used to be in her life (mostly ex's or guy friends of nearly 10 yrs ago) where she's claiming they are either calling, emailing, trying to meet with her etc. I know for a fact this is not the case; but her husband believes her because he doesn't know these people from a hole in the wall. I only know about this situation because she's comfortable talking to her husband about it, who then tells me - but she refuses to talk directly to me about anything that she knows I can vouch as being not true in the real world.

My tough spot comes in where I'm trying to support her, but having a tough time getting her to see reality. I can't understand if she really thinks this is real due to her bipolar, or what. She thinks these people are interested in her - which I know ties in to the possible promiscuous aspect of BP; I'm scared she could ruin other people's relationships...but I also don't want her to either embarrass herself or get herself into trouble, or have people think she's crazy....This is especially tough because I can't broach the subject because I'm not supposed to know about it in the first place.

Is it wrong to bring it up to her?
Is it wrong to gently tell her this isn't real (these guys aren't coming after her)?
Is it wrong to try to protect her?

I'm confused as to where my boundaries lie.

First are you not suppose to know about her bipolar or the 'contact' between her and her ex's ? If you approach her on this prepare for her paranoia to turn to you. I would approach her husband.

Agree with MM.

Confer with her husband.

Maybe she needs inpatient

I would be approach it by being kind, not interested in being right.

Our whole family is aware she has bipolar, and is medicated. We try to verify most information with her husband since she feels comfortable telling him the most. I am currently concerned because I believe her to be the one initiating these meetups/conversations with past people even though in the past they've clearly expressed not wanting to talk to her any more....that is if that part even exists. It's tough for me to know what she thinks is happening, what she wants to happen, and what is really happening. I'm afraid she'll either get (emotionally) hurt by these people when she realizes it's not true, or I suppose she could get into physical trouble too. She's not the most stable person even on meds.

My only hesitation with her husband is he's a bit naive, and tends to fall for her stories. One of her stories was that one of these ex's dropped by her house expectantly and insisted on talking to her. Another story is a different guy (who in the past had told her to eff off) called and insisted on telling her a secret, but she had to meet up with him to do so. She actually went to a park to "meet him", only to come back shortly after saying he didn't show.

I try to tell her husband that I knew these guys, especially how things ended, and there's no way in hell they'd want to talk to her again, at all. So he needs to look at it as something that's not true; instead he's worried strange guys are going to try to come to his house.

Because of his naiveness, I feel like I should approach her - but when he told me all of the above, he said she insisted I not know about it (probably because I would question her on it). So, it's like I want to help, I feel like to help I'd have to tell her I know about these stories she's been telling - but then she feels they're real to her, I need to figure out how to show her they are not. And I don't know how to do that.

Just out of curiosity, why aren't you supposed to know about her bipolar? Especially, as you said, the whole family knows.

Sorry if I'm not clear - I AM supposed to know about her bipolar...I'm NOT supposed to know about her guy stories...

And my interpretation of the reasoning is because I told her not to follow thru with her last (what I now believe was a story) when she told me her best friend's husband was into her. She only divulges in those who believe her stories...so, her husband.

As your not suppose to know pretend you don't know. Think what else has been a bit 'off'?

My daughter does the same thing. We've tried calling her out on it. She becomes very defensive and irritated. She insists what she perceives is true.
As long as she isn't hurting anyone we just let her live out her "delusions".