According to Perner, Ruffman and Leekam (1994), theory- of- mind develops more quickly in children who have siblings than in only children who have only their parents to play and interact with at home.

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According to Perner, Ruffman and Leekam (1994), having siblings helps with the development of theory-of-mind as children have more opportunities to interact and engage in social situations where they need to consider the thoughts and feelings of others.

According to Perner, Ruffman and Leekam (1994), Theory- Of- Mind