My brother’s penis looks really different from mine, and he doesn’t look like my dad. Could it be possible that we’re not related?

Like snowflakes and falling leaves, penises really do come in all shapes and sizes, and no two are exactly alike. There’s a wide range of what is normal (even within families) for all body parts, including penises. I wouldn’t jump to conclusions about whether he’s a blood relative based on appearance as even twins can look different. Your age and stage in development also affect your appearance.

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