AbstractHome observations were done on sibling interactions in 31 families with a child having Down's syndrome and a non‐handicapped sibling The siblings with Down's syndrome initiated less prosocial and agonistic behaviour, but imitated more frequently than their non‐handicapped siblings. These effects were found regardless of birth order. There were no effects of gender. Higher levels of prosocial behaviours among large interval dyads and in dyads with a second‐born Down's syndrome child were primarily due to the age of the non‐handicapped sibling. Results were similar to those in previous “normative” studies of sibling i
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