Today on Cool Kids, we bring you I'm My Own Grandpa as recorded by Willie Nelson. Originally written by Dwight Latham and Moe Jaffe, who were inspired by a book of Mark Twain anecdotes. Twain had discovered a way that, through a series of marriages, a man could become his own grandfather. It's a very complicated process, but wikipedia has the whole thing figured out. Maybe you could turn this into an exercise where you teach your kid about everyone in the family and how they're related. If your family is as complicated as Willie's, though, maybe you should keep some headache meds around.
This video is cleverly done in The Sims 2, and having a visual for the family is actually very helpful. Enjoy!