Generation Gap: A science fiction short story

Harrison has lived his whole life on Mars. The most exciting event of his day is book club until he receives a message from his long-absent father on Earth: "You will understand everything when you see who I am and who you have become." Haunted by his father's words, Harrison leaves the colony behind and embarks on a journey full of unanswered questions and unexpected danger to return to the cradle of humanity where he will reunite with the man he thought was his father.