She looked over at Clark as he gave his 'explanation' and it took all her effort not to roll her eyes slightly. They were that. He was never going to let go of the fact that he just wasn't human, was he?
Kara looked back to Lois with a smile. "The story is I'm related to Clark legally through his adopted father." she explained. "But I'm not. We're biologically related. Our fathers were brothers." her smile turned into one that was less amused, a touch of sadness reaching her eyes.
"Our planet was twenty-three galaxies away from the Earth in our world. We're the last of or family. Clark was just baby when he arrived." she said, glancing at him with a slight smile. "But I was a teenager. You just didn't see me around because I was trapped under water, and he didn't know I existed to find me." she shrugged, it was a sore spot for her, not getting to Clark when she was supposed to, but she was moving on. Pretty much over it.
At least she wasn't completely freaking out yet. That was good, right?