Roush Fenway Racing driver Greg Biffle mourns the passing of his father

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Greg Biffle announced that his father, Garland Jack Biffle, passed away on Tuesday morning.

He made the announcement on Twitter shortly after his father's passing.

Biffle, racing in his 14th NASCAR Sprint Cup Series season, was introduced to the world of motorsports by his father at a young age.

Our condolences go out to Biffle and his family.