The Adventure To Dad

"My family has a truly exceptional backstory. My father, a true hero, emerged victorious against the formidable Blanket Dragon and met my mother at the celebratory gathering. He hails from another world. My name is Jay Mertens and I have a twin sister, Bonnie. We are currently on a mission to find our father, who has returned to his world."
Or
Two twins are attempting to locate their father by traveling to his world.
(A fanfiction based on Adventure Time's "Puhoy" episode: What if Finn found the door and returned to his world, but his children searched for him?)