Katie is born after a heavily pregnant Mandy is knocked over during a robbery at the local shop. Mandy's protective parents, Paddy (Sean Gilder) and Mimi (Tina Malone), forbid the Gallaghers from having anything to do with Katie, with the Maguires intent on raising the baby. However, Mandy decides to begin a serious relationship with Lip in order for Katie to have both her parents in her life, so she moves in with the Gallaghers, to the disappointment of Paddy and Mimi. Mandy later reveals that she named Katie after Mimi, with her first name actually being Katherine. Lip eventually moves to Nottingham in order to go to university, leaving Mandy and Katie with the other Gallaghers. After Lip's father, Frank Gallagher (David Threlfall), leaves ecstasy pills lying around, Mandy is terrified that Katie has swallowed some, however this turns out to be a false alarm.