Bart heaved a sigh but didn't quite roll his eyes and plodded forlornly over to a chair in which he sat. Bart put his elbow on his knee and balanced his chin on his fist, looking around and trying to be still. His leg was still jumping though, toe tapping a mile a minute on the floor.
"No, you don't have any kids-- but I'm not supposed to talk about the future a lot. It could create a paradox where like... I'm not born and the moon is blue or something; didn't you ever see Back to the Future? I could make out with my own mom and that's gross."
Bart picked his head up a bit and stared down at his feet where his toes only barely scraped the floor. "I guess the fast version is you and Grandma Iris go to the future and have my dad and then my dad grows up and marries my mom and then they have me." Bart looked like he might say more, a dark, pained expression crossing his face- but he didn't continue the story and instead just looked away.