López's siblings, Mark, Diana and Jean Lopez (coach), are all USA National Team Members in Taekwondo. His younger siblings, Mark and Diana, also represented the United States at the 2008 Beijing Olympics, marking the first time since 1904 that three siblings have been on the same Olympic team. Both López and siblings, Mark (men's featherweight) and Diana (women's featherweight), made sports history in April 2005 when they all claimed a world championship title at the same event (2005 World Taekwondo Championships) with their oldest brother, Jean, participating in the feat as their coach. Steven Lopez and Diana Lopez both qualified for the 2012 Olympic games in London in July 2012 at the Olympic Training Center in Colorado Springs, CO.