Lawyers for Boston Marathon bombing suspect Dzhokhar Tsarnaev yesterday asked a judge to require the government to turn over interviews with the accused terrorist’s family as well as grand jury testimony, arguing the evidence could be critical as both sides prepare to make their death penalty arguments to the Justice Department.

“The government has taken the position that, ‘Look, we know what we have and you don’t need to know about it,’ ” attorney Judy Clarke told U.S. District Court Judge George A. O’Toole Jr. “It’s of concern that the government thinks it can make a decision based on what they know without some defense input. They may have a completely erroneous story.”

Tsarnaev is accused in the terror attacks at the finish line of the April 15 Boston Marathon that killed three spectators and maimed and injured more than 260 others, and the subsequent killing of an MIT police officer. Of the 30 federal weapon and conspiracy charges Tsarnaev faces, 17 are punishable by death.

Federal prosecutors plan to submit their sentencing recommendation to U.S. Attorney General Eric Holder Jr. “on or before” Oct. 31. Holder will have up to 90 days to issue his decision.

“We have provided a great deal of information,” prosecutor William Weinreb told the court yesterday. He said the six months the defense has had since getting the case “is reasonable time” for them to have compiled their own report to Holder based on “whatever they may have come up with in their own investigation of the case.”

Calling it “the biggest philosophical dispute we have with the government right now,” fellow public defender Miriam Conrad argued the missing discovery is potentially “relevant” and “exculpatory.”

Tsarnaev, 20, did not attend yesterday’s hearing.

Both sides are due back in court for a further status update Nov. 12.

Whatever prosecutors intend to recommend as just punishment for Tsarnaev will not be made public until Holder’s decision lands.