You find yourself in the past. The year is whatever year you happened to be 4 years old. You're in your current body. How do you convince your family of who you are?

You don't get to bring anything back with you, other than a set of nondescript clothing that won't stand out in whatever year you end up in. You don't get to bring an ID, phone, money, any future tech. Essentially your pockets are empty. You will have 24 hours in the past. You spawn 10 feet from your front door, and are unnoticed by anyone as you spawn in. As you knock on the door you realize that it's your 4th birthday party and your extended family have gathered as well.

How do you convince your family that you are you? What do you say? What conversations do you want to have with family members that might not be around anymore?