Reference for Ketubot 55:8

<big><strong>מתני׳</strong></big> ואלו נאמנין להעיד בגודלן מה שראו בקוטנן נאמן אדם לומר זה כתב ידו של אבא וזה כתב ידו של רבי וזה כתב ידו של אחי

The following are believed to testifying when they are grown-up about what they saw when they were minors: A person is believed to say “This is the handwriting of my father”, “This is the handwriting of my teacher”, “This is the handwriting of my brother”;

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