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?

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brothers-sqLike 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.