Mountain gorillas maintain strong affiliative biases for maternal siblings despite high male reproductive skew and extensive exposure to paternal kin.

Age difference remained a highly significant predictor of aggression (p<0.001).

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We find similar patterns in our dataset: average age within the dyad has a massive negative effect on play rates; a marginally significant negative effect on grooming; a positive effect on the frequency of close proximity to others; and a very large positive effect on aggression.

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