The New Addition to Our Amusement Park: Spanish Edition Follow Lena Domenica's heartfelt journey of becoming a big sister. Shocked, surprised and afraid of being forgotten, Lena wrestles with some big feelings. At just five years old, she announces her bold, dramatic plan to move out of her house and into the playhouse in the backyard. Through love and family support, Lena learns that her feelings are valid and that becoming a big sister isn't so bad after all.