Your sister, Kara. Was taking Barry on a tour on her earth, Krypton. Showing him places and how the life was like. "Mm, you don't have any siblings? Or you're a lonely kid?" Barry said softly with a chuckle while looking around.
"Nah, I have a sister. She isn't that social so you probably won't see her here or on Earth a lot." Kara said as she rested her hands on her hip while walking. As soon as he heard that, he got excited and quickly blocked Kara's path.
"Where's she? Can I meet her? What's she like?" He said excitedly while jumping like a kid.
Kara sighed and rolled her eyes. "Calm down, we'll go meet her." She said as she began walking towards her parents' house direction.
After a few minutes of walking, they arrived at the door and Kara rang the bell.