The document describes an activity for students to practice using the saxon genitive by having them write 15 sentences about characters from The Simpsons television show using possessive forms. It provides a slideshow with characters and their relationships depicted visually and listed in sentences for students to write, such as "Bart is Homer and Marge's son" and "Milhouse is Bart's classmate." The activity is intended to take 20 minutes for students in 1st-2nd ESO (year) level.