Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: Unbeknownst to humans, there is a thriving, technologically sophisticated society of Martians living below the surface of Mars. The Martians Supervisor, while observing Earth, sees a mother persuading her son, Milo, to do his chores. The Martians decide to bring her to Mars, where her "momness" will be extracted and implanted into the next generation of nannybots. Meanwhile, Milo - who doesn't like following the house rules and doing chores and has been grounded as a result, tells his mother sarcastically that his life would be better without her, breaking her heart.
Later that night, Milo goes to apologize, but discovers his mom is being abducted. He runs after her, but they end up in separate parts of the Martian spaceship. On Mars, Milo is taken to an underground cell. He escapes and is chased by Martian guards, but he follows a voice that tells him to jump down a chute, and lands in a lower subterranean level. There, he sees a trash-covered landscape that is inhabited by furry creatures.
Milo is whisked away by the creatures to meet Gribble, a.k.a. George Ribble, the childlike adult human who had told him to jump down the chute. Gribble explains to Milo that the Martians plan to extract Milo's Mom's memories at sunrise, using a process that will kill her. Gribble, who is lonely and doesn't want Milo to leave, pretends to help Milo rescue his mother. His plan goes awry, leading to Gribble being captured and Milo being pursued by Martian guards. Milo is rescued by Ki, one of the supervisors who raise Martian babies. Milo tells her about his search for his Mom and what a human relationship with a mom is like, as Ki and her kin were mentored by only nannybots and supervisors and don't know of love.
Whose heart does Milo break?