Final answer:
In the novel 'Illuminae,' Kady Grant's father is offworld on a planet named Weyland. His location is mentioned but is not central to the main plot, which focuses on Kady's experiences after her home colony is attacked.
Step-by-step explanation:
In the book Illuminae, by Amie Kaufman and Jay Kristoff, Kady Grant's father is offworld on a planet called Weyland. The novel does not spend a significant amount of time discussing Kady's father or his whereabouts in detail, but it is mentioned that he lives on this different planet while Kady is on Kerenza IV, which is attacked.
Her father's location plays a part in her background but is not a central element of the plot, which predominantly revolves around Kady's experiences and struggles following the attack on her home colony and her journey aboard the fleeing spaceship fleet.