My mom believes deceased spouse has returned to earth

I gave your question to Gemini AI. This may help. The ones marked with ❌ are items I thought of before using AI

This is an incredibly heartbreaking situation, and it is actually more common in late-stage dementia than many realize. The user is dealing with a cruel combination of delusional misidentification (believing the deceased husband is alive) and Othello Syndrome (a type of paranoid delusional jealousy).

When standard psychiatric medications fail, the focus has to shift entirely from "fixing" the delusion to managing the environment and the emotional fallout. Here are the most effective, non-pharmacological strategies that have helped others in memory care units dealing with this exact scenario.

1. Radical Environmental Changes (The Window)

Because the delusion is anchored to a specific visual trigger—the senior living duplexes outside her window—changing her environment is often the most effective first step.

• ❌Obscure the View: If she cannot see the "other woman" or the duplexes, the visual loop in her brain might break. Use privacy window film (frosted or stained-glass style) that lets light in but completely blocks the view. Alternatively, use heavy, closed curtains or beautiful, large window decals.
• Rearrange the Room: Move her favorite chair, bed, or sitting area completely away from that window so her gaze isn't constantly directed outward.
• ❌Room Reassignment: If possible, work with the memory care facility to move her to a room on a different side of the building where the view is entirely different (e.g., a courtyard, a parking lot, or a garden).

2. Validate the Emotion, Detour the Reality

Trying to convince her that her husband is dead or that he isn't cheating will likely cause more distress, as her brain is incapable of processing that logic right now. Instead, use a technique called Validation and Redirection.

• Acknowledge the pain, not the delusion: Instead of saying, "Dad isn't cheating, he passed away," say, "Mom, I can see how deeply that hurts you. It is awful to feel betrayed by someone you love. I’m so sorry you're feeling this pain right now."
• The "Detour" (Distraction): Once she feels heard, immediately pivot her attention to something high-value and comforting. "Let’s go get a cup of tea and look at those old recipes," or "Come help me with this fabric/puzzle in the dayroom."

3. Partner with the Facility Staff

The memory care staff needs to be entirely aligned on a single strategy so they aren't accidentally reinforcing or fighting the delusion.

• Create a unified response script: Ensure every nurse, aide, and administrator responds to her complaints exactly the same way (validating her sadness, then redirecting her).
• Structured Distraction: Ask the activities director to schedule highly engaging, hands-on tasks for her during the times of day she is most prone to sitting by the window (often during "sundowning" hours in the late afternoon).

4. Re-evaluating Medication with a Specialist

The poster mentioned "no meds have helped," which is unfortunately common because Othello Syndrome is notoriously resistant to standard treatments. However, it might be worth discussing a few specific angles with a Geriatric Psychiatrist (rather than a general practitioner):

• Reviewing Current Meds: Sometimes, medications prescribed for Parkinson's, anxiety, or even certain dementia drugs (cholinesterase inhibitors) can actually exacerbate visual hallucinations or paranoia as a side effect. A specialist should review her entire list.
• Targeting the Anxiety/Depression: Instead of trying to medicate away the delusion (which antipsychotics often fail to do in these cases), doctors sometimes have better success medicating the consequent distress—using targeted anti-anxiety medications or antidepressants to help her feel less panicked and hopeless.

A Note for the Caregiver: This is an incredibly heavy emotional burden to witness. It feels like grieving a loss twice over. Suggesting that the caregiver speak to a counselor or a support group specifically for dementia-related behaviors can be a vital lifeline for their own mental health.