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Siblings need support and age-appropriate information about the diagnosis to prevent negative mental health outcomes. However, evidence-based support for siblings is limited. The current study aimed to explore siblings\u2019 perceptions of AN and parents\u2019 beliefs about siblings\u2019 understanding expressed within an intervention programme for siblings and parents.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>This qualitative study employed a hybrid approach, integrating deductive thematic analysis using the common sense model of self-regulation as a coding framework with inductive thematic analysis. The data materials comprised (1) interviews conducted by clinicians with siblings about the AN diagnosis, (2) siblings\u2019 understanding of AN as expressed in sibling groups, (3) parents\u2019 beliefs about what siblings understand expressed in parent groups, and (4) parent-sibling conversations about AN. Video and audio recordings of the data were transcribed and analysed. The sample comprised nine siblings of European descent, aged 8 to 15\u00a0years, and their parents. All siblings had a sister with clinically confirmed AN.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>The siblings had limited knowledge and expressed uncertainties about AN across the five themes identity (label and symptoms), causes, consequences, treatment, and timeline. In the inductive analysis, two additional themes were identified. The first, <jats:italic>Parental perspectives on siblings\u2019 understanding<\/jats:italic>, had two sub-themes: <jats:italic>AN as a confusing and complex disorder<\/jats:italic>, and <jats:italic>Discrepancy between siblings\u2019 understanding of AN and parents\u2019 beliefs about their understanding<\/jats:italic>. The second theme was <jats:italic>Barriers to communication about the diagnosis<\/jats:italic>.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>The results extend knowledge about informational support needs in siblings of adolescents with AN. Insights into what siblings and parents of adolescents with AN share about the diagnosis in different contexts can be used to guide the adaptation of interventions and policies.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Trial registration<\/jats:title>\n            <jats:p>ClinicalTrials.gov NCT04056884.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/s40337-025-01263-5","type":"journal-article","created":{"date-parts":[[2025,10,21]],"date-time":"2025-10-21T11:23:46Z","timestamp":1761045826000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["\u201cIt\u2019s like a car that doesn\u2019t like gasoline\u201d\u00a0- a qualitative study of siblings\u2019 understanding of anorexia nervosa in childhood: perspectives from siblings and parents"],"prefix":"10.1186","volume":"13","author":[{"given":"Amalie","family":"Schumann","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Torun M.","family":"Vatne","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Louise","family":"Dalton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth","family":"Rapa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Krister W.","family":"Fjermestad","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,10,21]]},"reference":[{"issue":"10227","key":"1263_CR1","doi-asserted-by":"publisher","first-page":"899","DOI":"10.1016\/S0140-6736(20)30059-3","volume":"395","author":"J Treasure","year":"2020","unstructured":"Treasure J, Duarte TA, Schmidt U. 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