On Monday, Zubeidat Tsarnaev told CNN's Nick Paton Walsh that she plans to come to the United States if she can see her son, despite pending shoplifting charges against her in Massachusetts.
Dzhokhar is at Federal Medical Center Devens. Authorities moved him there last week from Boston's Beth Israel Deaconess Medical Center.
He had what appeared to be gunshot wounds to his head, neck, legs and hand when he was captured on April 19 after a nearly 24-hour manhunt, according to the criminal complaint accusing him in the marathon blasts.
He is able to speak and has been interacting with staff, a prison spokesman said.
He has, however, apparently been less talkative since authorities read him his Miranda rights three days after his capture.
But the information gained from two sessions of questioning has produced good leads, a U.S. law enforcement official said.