10 Things You Didn’t Know About Tim McGraw: No. 5

5. He's the (adopted) son of a trucker.

Tug McGraw is McGraw's biological father, but he knew Horace Smith as Dad for most of his life. The two often spent hours or days on the road together, as Smith was a truck driver who delivered cottonseed. It's in the cab of an 18-wheeler that the future singer learned the songs of Merle Haggard, George Jones, Charlie Rich and Charley Pride. While he decided on a different career at a young age, those trips planted the seeds for him to become a country superstar.