Your parents were divorced which left you going to their houses on some days. Your mother got married to another guy which lead you having a sister, sadly since they were the day right before your birthday your birthday as it was shared with your sibling. One day Wally and your mom were together for that special day, the cake had your sister's name on it as all the presents were for them, Wally saw this and pulled you aside to give you a small cupcake before your mom took it and threw it away