Kate Emily Pearson is the daughter of Rebecca and Jack Pearson. Her twin brother is Kevin and her adopted brother is Randall Pearson. Kate struggles with her eating habits and body image, as a child she was teased by her so-called friends. Jack gave her "the Number Two" in The Big Three and "Katie Girl" nicknames. Her mother Rebecca nicknamed her "Bug." Coming from a family with a love of football, she is also a huge Pittsburgh Steelers fan.