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This study examined 7\u2010, 9\u2010 and 11\u2010year\u2010old children's polite and altruistic lies towards ingroup and outgroup recipients and the role of theory of mind (ToM) in these behaviours. Polite lies showed a group\u2010general pattern: children told them equally across group lines, independent of ToM. In contrast, altruistic lies displayed a marked ingroup bias that strengthened with higher ToM levels. These findings indicate that prosocial lies are context\u2010sensitive and governed by distinct social\u2010cognitive processes. By revealing that ingroup bias extends to prosocial behaviours involving tension between honesty and altruism, the study clarifies how social and moral considerations and group processes jointly shape the development of children's moral reasoning.<\/jats:p>","DOI":"10.1111\/bjdp.70075","type":"journal-article","created":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T10:56:10Z","timestamp":1791024970000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Norm conflict and ingroup bias in children's polite and altruistic lies"],"prefix":"10.1111","author":[{"given":"Dan","family":"Cui","sequence":"first","affiliation":[{"name":"Institute for Vocational Education Teacher Research Tianjin University of Technology and Education  Tianjin 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