"It's been incredibly hard to accept what happened to my boys," said Liz Norden, whose two sons each lost a leg in the April 15 attack. "I'm angry. I want to be there."
Tsarnaev, 19, is expected to attend the first of his court proceedings Wednesday to hear charges against him, ABC News said.
He is charged with killing three people in the bombing, as well as taking part in the murder of a Massachusetts Institute of Technology police officer and causing injury to a transit police officer, as well as a long list of federal terror-related crimes.
Tsarnaev is also facing charges stemming from a bomb and bullet battle with police in which he and his brother Tamerlan, 26, allegedly engaged.
The accused bombers' victims have been notified of the start time of the hearing in Boston's U.S. District Court, in a room adjacent to the trial of reputed gangster James "Whitey" Bulger, the Boston Herald reported.
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