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We will investigate the birth order effect found in Kaminski, Ravary, Graff and Gentaz (2010), who argue that firstborns have a disadvantage assessing kinship from facial cues only as they also use additional contextual cues such as perinatal association, and hence rely less on facial cues when learning to assess kinship in their own family. Later-borns do not have the contextual cue of perinatal association and therefore rely more on facial cues when assessing kinship. We will replicate this study with raters looking at child sibling pairs. Kaminski, G., Ravary, F., Graff, C., & Gentaz, E. (2010). Firstborns’ Disadvantage in Kinship Detection. Psychological Science, 21(12), 1746-1750. doi:10.1177/0956797610388045