Final answer:
Children usually start to say 'Yes' to show understanding after age two as they develop theory-of-mind (TOM), understanding others' beliefs.
Explanation:
False. Children typically say 'Yes' to show understanding after they are two years of age. Between 2-3 years old, children start to develop theory-of-mind (TOM), understanding that others have beliefs different from their own. This cognitive milestone marks a significant change in their comprehension of social interactions.
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