Test · Relationships

Is My Sister a Narcissist Quiz

Twenty-one short scenes, one honest question: is it everyday self-focus, family history or something wider? No verdict on her, none on you.

≈4 min Questions: 21

Two thrushes perched on a mossy garden bench beside a wooden board with half an apple, with roses and hydrangeas behind.

If you’re here, something about your sister keeps landing hard, and the word narcissist has probably crossed your mind. This quiz isn’t a test of whether you’re a good sibling; it shows how what you’ve noticed fits together. Pick the answer closest to what you’ve seen, even when none fits perfectly. It takes about four minutes and ends with a hypothesis, not a verdict. What if the friction has more than one explanation?

0%
A friend is telling the table about a new job, or a neighbor about a new roof. What have you seen your sister do with a story like that?
Your sister brings a cake, sends a link or gives you a ride. What have you seen in the moments after?
Picture your sister describing her week to a friend. How does her life sound next to other people's?
You mention something small she could do differently, like the route, the volume or the recipe. What have you seen?
Something went wrong through your sister's doing, and someone brought it up. How did she respond?
A disagreement between you two was put to bed. What have you seen happen to it afterward?
You tell your sister about something hard going on in your life. Where does the conversation go?
You and your sister remember the same event differently. What have you seen her do with your version?
Something she did landed badly, and you said so plainly. What did you see in her face and words?
Your sister needs something of yours: your time, your car, a favor. What have you seen when the answer is no?
There is something to share out, like a gift fund, a road-trip seat or a parent's weekend. What have you seen your sister do about it?
You've helped your sister with something big or small. What comes back your way?
You share good news: a new bike, a raise, a finished course. What have you seen your sister do with it?
Think about how your sister talks about the two of you side by side. What does the comparison sound like?
A good thing has happened to you and your sister says something about it. What comes out?
There was a falling-out between you two. What have you seen about how it gets told to other people?
You say no to something she wants from you. What does the reply sound like?
A disagreement flares between you two. Who else hears about it, and when?
Think back to how a parent treated the two of you as kids. What stands out?
Think about the times things get tense between you two. Where does the tension gather?
What has your sister said about her own childhood at home?

Maryna Lyadneva psychologist

Send this test

How this test works

Where the questions come from, what the scale rests on, and why the result is not a diagnosis.

Which explanation for a sister's difficult behavior fits what the reader has personally seen: ordinary self-centeredness, family and sibling dynamics, or a broad pattern across many situations.

Author Maryna Lyadneva

Rate this test
4.9/5
Methodology

This quiz cannot see her inner life, her reasons, how a parent would tell the family history, or anything about the reader. It sorts one thing: which of three explanations fits the behavior you have watched.

The questions were written for it, in the spirit of research on siblings and personality traits. Each answer is a scene that points to a passing moment, a family occasion or a wide spread of settings: everyday self-focus, family dynamics or a broad pattern.

An outside view notices real things, and such behavior can be easier for others to spot than for the person herself. Her account and an outsider's differ a lot on these traits, so what you report is a signal about actions.

This piece on siblings across life is mostly practical and addressed to parents, yet speaks about siblings directly.

This overview of how personality disorders are assessed is background: trained specialists, structured criteria, close people as sources of information. It covers personality disorders broadly, not sisters and brothers.

A note on limits. No result here, the broadest included, is an alarm about her, and none gives a reason on its own to decide anything about the relationship. What you get back is your own account of what you have seen, which is different from an assessment of her. The quiz is no diagnostic tool and cannot say whether a sister has narcissistic personality disorder; only a qualified specialist can, working with her directly, while relatives may supply information without deciding.

Questions

Is my sister self-centered, or is it narcissism?

Those are not the only two options. The word narcissist has been stretched well beyond its clinical meaning, and the same friction can come from a hard stretch between you, from the family you grew up in, or from plain self-centeredness. None of these hands her a clinical label by itself. The quiz asks what you have seen and points to the closest fit.

Does a broad result mean my sister has narcissistic personality disorder?

No. Only a specialist can answer that, and not from one person's report. A broad result says the behaviors asked about showed up in many settings in what you have watched, which is worth your attention. Talking to a therapist can give you clarity for yourself.

Could the cause be our parents and not her?

Yes, that is possible. Long-lasting coldness or rivalry between siblings is linked to how each felt treated by a parent, and none of it needs anyone to be at fault. If your answers gather around family moments, the result called Family Dynamics is the quiz's way of saying that is possible. It sits comfortably beside real personality differences, since the two can be present together.

Can a quiz say whether my sister has narcissistic personality disorder?

No. The quiz only holds your description of behavior and family history, so it has nothing to answer that with. A qualified specialist could, by assessing her directly; people around her can give background, though they do not decide.

Why is my sister like this?

Start with the family, because that is where much of an answer may sit. Siblings who grew up feeling treated differently by a parent can seem like opposite characters years later, even when neither is. Take that as a hypothesis about how relationships form; a complete answer about what is inside her isn't available from here.

Sources
  1. Hengartner, M. P., Eymir, A., & Haslam, N. (2026). Expanded definitions of psychopathology: Exploring concept creep in narcissistic personality disorder. Acta Psychologica, 264, 106604.
  2. Pincus, A. L., & Lukowitsky, M. R. (2010). Pathological Narcissism and Narcissistic Personality Disorder. Annual Review of Clinical Psychology, 6, 421–446. doi:10.1146/annurev.clinpsy.121208.131215.
  3. Ackerman, R. A., Witt, E. A., Donnellan, M. B., Trzesniewski, K. H., Robins, R. W., & Kashy, D. A. (2011). What does the Narcissistic Personality Inventory really measure? Assessment, 18(1), 67–87. doi:10.1177/1073191110382845.
  4. Finzi-Dottan, R., & Cohen, O. (2010). Young Adult Sibling Relations: The Effects of Perceived Parental Favoritism and Narcissism. The Journal of Psychology, 145(1), 1–22. doi:10.1080/00223980.2010.528073.