Disclaimer: Although as editor for CJ I have seen some chapters that have not yet been posted, I have not seen this topic discussed anywhere at this point.
Having worked for years with CJ on his stories, I drew a conclusion early on in Circumnavigation that Trevor's mother was not really dead. There has been nothing to counter this in any of the chapters thus far. Dirk is in on this secret - hence the undisclosed nature of the statute of limitations action Dirk is hiding. Dirk's push to have Trevor meet up with his mother's relatives is his way of having Trevor find out his mother is still alive. Granted all this is my own speculation, but it is not much of a leap, and wouldn't it be poetic justice for Mrs. Blake to be Trevor's mother? And if that is true, could it be that the Kookaburra is really the recommissioned Ares? Now there is something to think about...
I know some of you will think I am 'stirring the pot'; that I am a shill for CJ trying to throw you off track. I attest that I have not run any of this by CJ before I posted it - and the fact that you are reading this indicates what a fair and impartial host CJ can be when it comes to topics like this.