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Between and within siblings influence processes were examined as a function of relative levels of parental coercion and hostility to test the hypothesis that aggression contagion between twins occurs only among dyads who experience parental coerciveness. Teacher reports of reactive and proactive aggression were collected for each twin in kindergarten (<jats:italic>M<\/jats:italic>\u2009=\u20096.04 years; <jats:italic>SD<\/jats:italic>\u2009=\u20090.27) and in first grade (<jats:italic>M<\/jats:italic>\u2009=\u20097.08 years; <jats:italic>SD<\/jats:italic>\u2009=\u20090.27). Families were divided into relatively low, average, and relatively high parental coercion\u2010hostility groups on the basis of maternal reports collected when the children were 5 years old. In families with relatively high levels of parental coercion\u2010hostility, there was evidence of between\u2010sibling influence, such that one twin's reactive aggression at age 6 predicted increases in the other twin's reactive aggression from ages 6 to 7, and one twin's proactive aggression at age 6 predicted increases in the other twin's proactive aggression from ages 6 to 7. There was also evidence of within\u2010sibling influence such that a child's level of reactive aggression at age 6 predicted increases in the same child's proactive aggression at age 7, regardless of parental coercion\u2010hostility. The findings provide new information about the etiology of reactive and proactive aggression and individual differences in their developmental interplay. Aggr. Behav. 41:455\u2013466, 2015. \u00a9 2015 Wiley Periodicals, Inc.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ab.21582","type":"journal-article","created":{"date-parts":[[2015,2,13]],"date-time":"2015-02-13T12:01:33Z","timestamp":1423828893000},"page":"455-466","source":"Crossref","is-referenced-by-count":11,"title":["Aggression can be contagious: Longitudinal associations between proactive aggression and reactive aggression among young twins"],"prefix":"10.1002","volume":"41","author":[{"given":"Daniel J.","family":"Dickson","sequence":"first","affiliation":[{"name":"Florida Atlantic University Boca Raton Florida"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ashley D.","family":"Richmond","sequence":"additional","affiliation":[{"name":"Florida Atlantic University Boca Raton Florida"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mara","family":"Brendgen","sequence":"additional","affiliation":[{"name":"University of Qu\u00e9bec Montr\u00e9al Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank","family":"Vitaro","sequence":"additional","affiliation":[{"name":"University of Montr\u00e9al Montr\u00e9al Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brett","family":"Laursen","sequence":"additional","affiliation":[{"name":"Florida Atlantic University Boca Raton Florida"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ginette","family":"Dionne","sequence":"additional","affiliation":[{"name":"Laval University Qu\u00e9bec City Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michel","family":"Boivin","sequence":"additional","affiliation":[{"name":"Laval University Qu\u00e9bec City Canada"},{"name":"Tomsk State University Tomsk Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2015,2,12]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/1467-8624.00577"},{"key":"e_1_2_6_3_1","first-page":"197","volume-title":"Sibling relationships: Their causes and consequences","author":"Bank L.","year":"1996"},{"key":"e_1_2_6_4_1","first-page":"183","volume-title":"The impact of peer relationships on aggression in childhood: Inhibition through coercion or promotion through peer support","author":"Boivin M.","year":"1995"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1017\/thg.2012.129"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7610.2004.00375.x"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1037\/0012-1649.42.6.1299"},{"key":"e_1_2_6_8_1","first-page":"19","volume-title":"Children's sibling relationships: Developmental and clinical issues","author":"Buhrmester D.","year":"1992"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/1467-9507.00203"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1177\/0165025406071904"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1037\/0021-843X.101.1.18"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1037\/0012-1649.40.2.149"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0954579403000099"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1022570107457"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4757-9116-7_4"},{"key":"e_1_2_6_16_1","first-page":"201","volume-title":"The development and treatment of childhood aggression","author":"Dodge K. 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