Outcome, not relationship
This is the load-bearing idea, and it comes from Lindsay Gibson. Before an interaction with an emotionally immature person, ask honestly what you are trying to get. If the answer involves being understood, being regretted, or being finally seen, stop and pick a different one — because the moment the subject becomes the relationship, an emotionally immature person regresses and starts working to get you to stop upsetting them.
A specific goal keeps you talking to the adult part of them. "I want a straight answer about Christmas." "I want to say the thing about the comment in front of my kids." "I want an hour that stays pleasant and then I leave." All of those are achievable regardless of how they respond, which is precisely what makes them worth aiming at.
Express, and then let go
The second move is the one that feels wrong and works anyway. Say the true thing, calmly, without editorial — and release any need for it to be received. The point of speaking is not to change them. It is that you stated your own position, which is the part entirely within your control and the part that quietly rebuilds a sense of being a person rather than a role.
This is why the opening line in the planner names the release explicitly. "I am not expecting a particular response to this" is not politeness. It takes the pressure off them, which lowers the chance of a defensive escalation, and it takes the disappointment off you, which is the more important half.
Manage the interaction, do not engage with it
The third move is practical. Decide the length before you arrive. Decide which topics you are willing to be in. When the conversation gets diverted — and it will, because diversion is the reflex — name it, decline it, and ask the same question again. Emotionally immature people have no good counter to plain repetition; the avoidance breaks down if you stay polite and keep returning to the one thing.
Alongside that, run a quiet narration of what you are observing. Describing behaviour to yourself in words — tone, posture, what just happened to the topic — is not a mind game. It moves the work into the part of your brain that handles language rather than the part that handles threat, which is the whole mechanism by which people stay out of an emotional contagion instead of catching it.
A warning about sudden openness
Sometimes this approach produces an unexpected result: the parent softens. Gibson flags this as the moment of maximum risk, because it reactivates the old hope — they are finally going to give me what I needed. If you step back into wanting, they will feel the pressure and retreat, and the opening closes as quickly as it appeared.
The uncomfortable arithmetic is that they tend to be available in inverse proportion to how much you need them to be. Meet the openness as one adult meeting another, enjoy it, and do not spend it.
Where to go next
If you are not sure which kind of avoidance you are dealing with, the four types quiz sorts it, and the answer changes the redirect line. The emotionally immature parent test asks whether the pattern is there at all. And if what you actually need is a boundary rather than a conversation, the boundary script builder is the closer tool.