Rasputine and their sons (Maria, Varvara and the boy)

Does someone knows what happened to the youngest child of rasputine, Varvara?

In the book Rasputine's Daughter by Robert Alexander, he said that Varvara died at St. Petersburg in 1960 but that's proved?

And what hapened to her governess and mistress Dunia (that live with maria varvara and rasputine in st. petersburg)?

ADITIONAL INFO: Maria left descendants that actually live around Paris, Varvara aparently died around '60 (BUT IF ANYONE KNOWS IF THAT'S PROVED PLEASE SAY SOMETHING) in St. petersburg and the boy died by a fatal disease in Siberia in the Sovietic Union time at a concentration camp.

THE GREAT MYSTERY IS: WHAT HAPPENED TO DUNIA AND TO A WOMAN THAT WAS DEVOTED TO RASPUTINE WICH NAME WAS MADAME LOKHTINA

"Rasputin's Daughter" is a work of fiction.  It is not a real account of the events.  Varvara was detained by the Communists, when she was found trying to board a train for Berlin, sometime around 1920.  She had a diary that had been kept by the Tsarina.  She mysteriously died of poisoning shortly after being captured by the Communists.
Dmitri, Rasputin's son, was banished to Siberia with his mother, Praskovia, when they wouldn't go along with the Communist program and share their farmland.  Both died in Siberia, not too long afterward.
You might want to read, instead of novels, some history books on the subject.  My book, "Rasputin and The Jews" recently came out and is on Amazon.

   Attention:  Reply # 3 and "delincolon":  I hope that "morvilaRomanov" from Portugal will see your answer.  He was quite active in 2009 and had interesting questions, etc.  However, he hasn't been heard from since July 21, 2010, though he is still "active" on the register.
   He seems/seemed to be quite the fan of the author, Robert Alexander, and excitedly informed us on 11/24/09 that Mr. Alexander's "The Kitchen Boy,"   ".......starts filming in the summer of 2010 AND WILL BE ON CINEMAS IN 2011."  When asked his source of information, he replied, " robert alexander said that to me for mail."  
   As we know, this has NOT happened thus far, and possibly may never (given the new historical discoveries), as it seems to be "stuck", potentially not beyond a screenwriter stage.  Our last contact from "morvilaRomanov" was on 07/21/10.                                                                Regards,  AP.

[Mathematic, art and history in ♥]

She had a diary that had been kept by the Tsarina.

Was it actually Matyorna who had kept Tsarina's diary? However, according to the Russian site:

'' Варвара Распутина умерла ещё в 1925 году.'' (Varvara Rasputina died in 1925).  However, it seems to be hard to tell when exactly she passed away. (Source -- Rasputin's grand-daughter).