Simplify the following text for a Grade 7 native English-speaking person.
Original: Xenia wrote on 15 March 1910 that she did not understand `` the attitude ( behavior ) of Alix and the children to that sinister Grigory '' .
Simplified: Xenia wrote on March 15 , 1910 that she could n't understand '' ... the attitude of Alix and the children to that sinister Grigory ( whom they consider to be almost a saint , when in fact he 's only a khlyst ! ) ''