What did Bruno think of moving way?

When Bruno asks his mother how far away they will be moving, she tells him it's quite far away and that he will have to say goodbye to his school friends, Karl, Daniel, and Martin. Bruno is unhappy with this news but when he complains, Mother silences him. She says she wishes they had more time to prepare, but "thanks to some people," they are leaving rather last-minute. Bruno knows that when his mother says, "some people," she's referring to Father.