Last week, Jake Kovalcik, father of 9-year-old, hearing-impaired twin sisters Riley and Erin Kovalcik, tweeted a letter his daughters wrote to Seattle Seahawks fullback Derrick Coleman, the NFL's first legally deaf offensive player. The groundbreaking athlete wrote a letter back to the twins and on Thursday took time out of his busy Super Bowl week schedule to surprise them on "Good Morning America." See it all in the video above.

Riley and Erin's original letter to Derrick Coleman:

Derrick Coleman's response to Riley and Erin:

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