Tim McGraw finds connections from George Washington to Elvis Presley as he digs into his family history on NBC's "Who Do You Think You Are."

When talking about his relationship with his famous baseball great father, Tug McGraw, Tim gets emotional, holding back tears.  At other times, he makes jokes to lighten the mood.  But in the end he discovers he gets his spirit, drive and determination from his ancestors.

Watch Friday's episode with Tim on NBC.