The Simpsons - Season 23 Episode 9 -

It's the most wonderful time of the year, and the Simpsons flash forward thirty years and find themselves in a tech-savvy, futuristic Springfield. Bart and Lisa have children of their own and decide to spend the holidays as one big family at Homer and Marge's house. Lisa and Bart turn to Homer and Marge for parenting advice and begin to realize that the apple doesn't fall far from the tree.