Brothers in Sport and Song

The thing I like most about football is star quarterback Peyton Manning of the Indianapolis Colts, and one of the things I like most about Peyton Manning is that he has a younger brother who is also a star* quarterback on a team that wears most of the same colors as the Indianapolis Colts.
(*By "star" I mean "appeared in a series of Toyota commercials that may or may not have aired outside of the Tri-state area.")

While I like all configurations of sports families (Griffey and Griffey Jr. and Griffey, C., for example), I REALLY LIKE sports brothers. In fact, the ONLY thing I like about B.J. Upton is his brother Justin. So, when baseball commentators began talking about Detroit Tigers prospect Scott Sizemore this spring, I automatically wanted to believe that he was the younger brother of Cleveland outfielder Grady Sizemore.

Shared trait: Crooked grins

Although I can't find any proof on the internet that Sizemore and Sizemore are brothers, I also can't find any websites that specifically say that they aren't.

Shared Trait: Bad running faces

If Scott Sizemore were exceptionally ugly, it would be easier for me to accept that the two Sizemores aren't genetically linked. Does it follow, then, that Scott Sizemore's serviceably standard looks can be used as further evidence that he and Grady are related?

God, obviously not. Didn't you take logic in high school?