Rehearsing a hard conversation with a chatbot genuinely helps. What it cannot rehearse is the other person's face, and that was always the difficult part.

Your sister does not know any of this is happening.
Nothing has been said to her. No question has been asked. As far as she is aware it is an ordinary week, the arrangement about your mum is simply the arrangement, and nobody has a problem with any of it.
You have had the conversation eleven times. In the car. Standing at the sink. At half past one in the morning with the landing light off. And on Sunday you opened a chat window, typed the whole thing out, asked how she might take it, and got three likely reactions back with a way to answer each one.
That is not a strange thing to have done. Around a quarter of people now say they have rehearsed a difficult conversation with a chatbot before having it for real. The work versions get most of the coverage: the pay rise, the resignation, the review somebody has to be given. The private ones are quieter and far more common. What to say to a sister about your mum. What to say to a partner about the drinking. How to tell a friend you cannot lend it again.
It works, as well. A study this year took more than thirteen hundred people and gave some of them a few minutes of preparing with a chatbot first. The ones who prepared were meaningfully more likely to go and actually have the conversation in the week that followed. That is not a small finding. Moving a person from not saying it to saying it is the hardest yard in the whole business, and anything that shortens that distance deserves to be taken seriously rather than sneered at.
The reasons it helps are not mysterious. You hear the sentence out loud before it costs you anything. You find out that the thing you have been carrying can be put into words at all, which is never obvious from inside it. And you get to run her likely reply without her face attached to it, which takes enough heat out of the moment that you can think.
So this is not a piece about a machine making you worse. For a lot of people it has got them through a door they had been standing outside of for years.
Preparation has a feeling to it. The feeling arrives whether or not the conversation does.
There is something you have noticed and not said to anyone, because saying it out loud sounds ungrateful.
The words keep getting better. You are no closer.
You have a version now that is fair to her. It concedes what she has going on. It does not accuse anyone of anything. You could deliver it in ninety seconds. You have read it back so many times it has stopped sounding like you.
On Thursday you had four clear hours with her and you talked about the garden.
Then at midnight it starts up again, the same conversation going round without arriving, and by two you are rewording a line you have already reworded forty times.
What the preparing gave you was relief. Real relief, the kind you can feel go out of your shoulders. An hour of it, sometimes a whole evening. And relief was supposed to be the thing that arrived after the conversation, not instead of it.
That is the part worth watching. A rehearsal lets just enough pressure out to make the week survivable. The urgency drops. The thing stays unsaid, and now it stays unsaid comfortably, which is the version that lasts longest.
You can also walk in with wording nobody could fault and still lose her in the first thirty seconds, because what she hears is not the sentence. It is that you came in with one.
It was never the wording. It is what happens in her face in the second after you stop talking. The pause. The small change around her mouth. The particular silence of a person deciding whether to be hurt.
A chatbot can produce her words. It cannot produce that. It has no face and nothing at stake, and it cannot be disappointed in you, which is exactly what makes it bearable and exactly why the practice does not carry across. You have rehearsed the half of the conversation that was never the problem.
It cannot be disappointed in you. That is what makes it bearable, and what makes it beside the point.
It listened, as well. It listened better than most people manage, without interrupting, without its own version of your mum to defend. You felt understood at eleven at night by something that has never met either of you. On Monday you were exactly as unable to speak as you had been on Sunday.
None of that is an argument for saying nothing to anyone. Being heard matters, and plenty of people have nobody at eleven at night. The point is narrower than that. Feeling understood and being changed are two separate events, and the first one is far easier to come by.
There is usually a second thing sitting underneath the first. The rota is not really what the conversation is about. Your mum is going, slowly, in front of both of you, and the loss neither of you will name is doing most of the work in every exchange you have. Say the thing about Tuesdays and you are three sentences from the other thing. So you draft. You redraft. You stay out of the room.
I work with people who have been preparing the same conversation for years. Ordinary people, mostly, with a sibling or a parent or somebody they see every week. Not one of them is short of words. What has to change is not the script. It is what another person's displeasure does to you when it lands, and that runs well below the level anyone drafts at.
When that shifts, the preparing mostly falls away on its own. Not because you finally found the right version. Because you stopped needing one.
The conversation, when you have it, will be shorter than any draft. It will go somewhere you did not plan. She will say something that was not on the list of three. And you will still be there afterwards, in the same kitchen, with it said.