Looking for a little advice with a story I'm writing

[Great Rumbler]

I don't want to be too harsh, but I'm afraid both do sound a tad "done before".

There are very few things in scifi and fantasy that aren't.

To me, a long lost relative is still a total stranger. Just because the past connects in a purely scientific way doesn't mean I suddenly have to have some emotional investment in such a person.

Then why do a lot of adopted children try to find out who their real parents are?

One of the reasons I considered taking it that way was because Kara as a person is very emotional UNconnected. So has no friends or family and Martin is the only person in the world that she even cares to talk to. The idea was that she has been basically drifting along with no real purpose in life, but Aaron turns out to be her brother and she discovers that she wants to take care of him since their both orphans now. Remember, Aaron came to Earth because his parents were killed. It basically comes down to what I want to do with my characters really. The more I think about it, the more I like the idea of doing it this way...