Shinzon watched over Ruekana while she was unconscious.  When she woke up he says to her after she spoke, "When a vampire goes into slumber there is only a small group of people that wake him out of it.  The group consisting of the person who turned them, their own family, and their soul mate.  Since you are neither of the first two...I guess you fall under the third category....that is unless you are a relative I never met."