Debbie Phelps, also known by her handle @MamaPhelpsH20, gave birth to Michael Phelps, the most decorated Olympian of all time. As the proud mother of a merman, she's as adorably active on Twitter as she is in the stands.

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With over 13,000 followers, Mama Phelps is a champion in her own right, helping swimming fans stay abreast-stroke with both adorable old pictures and up-to-the-second updates. She shares great throwback pictures.

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