What if Kara and Kal-El both were found by the Martha and Jonathan Kent that night?

So often whenever we're introduced to Kara Danvers / Supergirl, something has happened to make her arrive to Earth years after her cousin Kal-El, making her younger than her cousin. What if Jor-El's plans worked? What if she arrived with him and they were both adopted by the Kents? How would knowing where he came from changed and shaped Clark's personality and his life on Earth? How would having Kara as his 'big sister' have changed the Kent family dynamic and Clark's goals in life? Would she have become Supergirl while a teenager (hence the dreaded 'girl' moniker) or would she have encouraged Clark to hide his true self after a terrifying visit from Trask and B39? Would Clark still want to be a reporter? How would he meet Lois?

In the Supergirl tv show, Kara arrives to Earth around age 12. So, she should start gaining powers from the moment she arrives. While Clark will have at least 10 years to live a semi-normal life before the development of powers. Also, by this time Kara will be old enough to have moved away from the farm or gone to college. Would she postpone *her* life as Clark will be just be gaining his powers, so she can help him through the transition? Would any of this cause strife between them?

Ooh, I've wanted to do a Kara-arrives-with-Clark story for a while now, but still have too much on my plate to really think about it. You bring up some cool points, though!