Dad or son?

Over a 13-year period, University of Massachusetts men's lacrosse coach Dick Garber coached against his son Ted's New Hampshire teams on quite a few occasions. Mrs. Garber, Dick's wife and Ted's mom, was asked once by a newspaper reporter who she rooted for.
"Ted," she answered quickly.
"Really? Why?" responded the reporter, who likely expected her to say something noncommital.
"Because Ted is my son, my blood," she said. "Dick is just some guy I sleep with."