In "The Last Voyage of the Ghost Ship" the boy's mother doesn't show interest in the story that her son tells because this story is too far-fetched and unreal, she thinks the boy is fantasizing and imagining non-existent things.
"The last voyage of the ghost ship" is a story written by Gabriel Garcia Marques. In this story the author makes extensive use of magical realism, which is a literary genre where magical elements are represented in the real world.
In "The last voyage of the ghost ship" we are introduced to a boy, who when observing the horizon, sees a ship and a captain that appears and disappears constantly, when the boy goes to investigate about this ship, he realizes that this ship and his captain leave no tracks and no evidence of their existence, but the boy always sees them.
He tells about it to his mother, but she doesn't pay attention to the words he says and shows no interest, because he believes that this is too fanciful a story and that the boy is making it up.
You can find more information about magical realism, a genre often used by Gabriel Garcia Marques, at the link below:
brainly.com/question/19963556?referrer=searchResults