Maybe she means that they are not the same people who she brought to america, hence the second part where she claims that the US took her sons away. What chance do you thing the father has of getting into the states after his statement:
The brothers' father, Anzor Tsarnaev, told reporters he would be travelling to the US. He said: "I am going to the United States. I want to say that I am going there to see my son, to bury the older one. I don't have any bad intentions. I don't plan to blow up anything."
Banging the table as he spoke, he said: "I am not angry at anyone. I want to go find out the truth."