You were kind of annoyed with being the only child. You find it boring, and you don't want all of your parents' attention laser-focused on you all the time, like it has been since you were born. With that in mind, you grasp the pen tightly, and write out "I am not an only child."
You close the book and stand up. You walk out into the hallway and see your mom walking away holding something. You follow her into the kitchen. She was holding a baby! You now had a little baby brother! You look around and see that everything in your house is set up for what you guess to be a nine-month-old. This baby will draw their attention perfectly!
You quickly look around to see if you can find his name, and luckily it's written on his bib. "Evan."