Brother & Sister Share Special Hearts

"Watching 11-year-old Weston Williams ride his unicycle or three-year-old Delaney Williams play, one would never suspect that brother and sister were born with a serious, life-threatening heart condition that causes an abnormally slow heartbeat. Weston's first pacemaker was implanted at UCSF in July 1998. And Weston's younger sister, Delaney, had her pacemaker - the smallest model available - implanted at birth.