Answer:
The narrator's habit of looking out the window suggests that they long for something different or missing in their life.
Explanation:
This main detail about the narrator and the supporting details in the passage shows that the family might be longing for the life they used to have before such as life at Terra before going to Mars. According to the narrator, his imaginations run wild while looking out of the window. Though little, compared to the others she might have imagined life in Terra.
The sentence in paragraph 7; "Sometimes I wish I got to grow up in Terra and get bigger" supports the idea that the family might have longed for something different or missing in their life.
This could be the death of a family member, or a certain academic/athletic achievement. Maybe the day you got a pet or the day that pet died. Maybe when you completed an important goal. If it's an important memory to you, you could use it.