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Here, we propose that a similarly adaptive strategy in humans is using kin terms for people who are not closely genetically related. Irrespective of the initiator attributing a kin term to a non-kin, we call this kin term mimicry (KTM). The emergence of human sociality and language allowed not only easy kin recognition, but also led to strong positive emotions related to such kin names as \u201cmother,\u201d \u201cfather,\u201d \u201cbrother,\u201d \u201csister,\u201d \u201caunt\u201d or \u201cuncle.\u201d Although the phenomenon of using kin terms of genetically unrelated people is well known in the social sciences, here we discuss it in the light of evolution. We notice this is an evolutionary adaptive cooperation strategy, which allows us to predict in which ecological or social circumstances it will be more prevalent. We postulate specific testable factors that affect the prevalence of kin mimicry. We also discuss who is more likely to be an initiator of calling non-kin a fictive kin, and who benefits from such behavior. The KTM hypothesis postulates that an individual or social group initiating or bestowing kin terms usually receives more benefits (economic and\/or psychological support) from such mimicry.<\/jats:p>","DOI":"10.1007\/s12064-023-00393-1","type":"journal-article","created":{"date-parts":[[2023,6,5]],"date-time":"2023-06-05T16:02:09Z","timestamp":1685980929000},"page":"199-203","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Kin term mimicry hypothesis"],"prefix":"10.1007","volume":"142","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7418-475X","authenticated-orcid":false,"given":"Bogus\u0142aw","family":"Paw\u0142owski","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anna","family":"Chmieli\u0144ska","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,6,5]]},"reference":[{"issue":"1\u20132","key":"393_CR1","doi-asserted-by":"publisher","first-page":"37","DOI":"10.1163\/15685373-12342167","volume":"16","author":"M Abou-Abdallah","year":"2016","unstructured":"Abou-Abdallah M, Kashima Y, Harb C (2016) \u201cBrothers\u201d in arms: Does metaphorizing kinship increase approval of parochial altruism? 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