The number of Sam's siblings and their back stories change from the start of the series up until the 2-part episode "The Leap Home". In the first season, Sam mentions having a sister named Katie. In the 2-part pilot "Genesis", Sam mentions that she married a Naval Officer named Jim Bonney. However, in the first season episode "The Kamikaze Kid", which hinges on Sam stopping a sister from marrying an abusive boyfriend, Sam mentions that Katie married and abusive alcoholic, later named "Chuck" in the "Leap Home" episode. Also, in early episodes, Sam never mentions having an older brother named Tom until the "Leap Home" episode.