Why is it that so many people don't take the time to at least TRY and make their posts legible? Nobody's asking for perfect grammar and punctuation, but this is just...
Yes.
Family? Arrgh, I hate that, <.<. Seriously: it's very, very unlikely. At most, Sora is a relative of Ven, and that's that. But that would be a pretty uncreative and lame way of connecting them.
They got chosen because of their strong hearts. Nothing else.
I think you're forgetting about MX and his apprentice.
No, he wasn't. He was more in the gray, really.
but say things clearer and then was good and riku consumed by dark turned good
It happens ten years before KH1 begins, so no.
Also, Kairi=/keyblade master. That keyblade was Riku's, not hers, and until she is chosen by one, she's not a keyblade master.