The Boston Red Sox, proudly. My dad starting going to Fenway Park in 1948, he saw the heartbreaking losses in '48 and '49, went to the 1967 and 1975 World Series (catching games in STL and CIN, not just BOS), took me to my first game in 1976 (saw Hank Aaron play for the Brewers at Fenway).
Yes, it was in the blood from the get-go. I've lived in the DC area for almost 20 years now, but my affection for the Olde Towne Team remains diehard. My dad's still kicking at age 81, watches every game from his living room in Massachusetts. I'm honored and delighted that he lived to see 3 championships for the team he has loved for more than six decades.