Nathan Carman, the Vermont man at the center of separate probes into the murder of his wealthy grandfather and disappearance of his mother, wants to take $150,000 from a trust controlled by his aunt so he can hire a lawyer to defend himself in a lawsuit brought by his relatives, the aunt’s attorney said Wednesday.

But even as he seeks the cash, said Daniel Small, a lawyer for Valerie Santilli, Carman’s aunt, Carman refuses to disclose information about his assets. Small spoke to the Globe one day after a hearing in a West Hartford, Conn., courtroom at which Judge Owen Eagan heard oral arguments on Carman’s motion to tap the Nathan Carman Family Trust for legal fees.

Before his death, Carman’s grandfather, the developer John Chakalos,established the trust for “backup’’ and “life expenses’’ for Carman, Small said. The trust currently has about $270,000 in it, and Santilli is the trustee, according to Small and prior court filings.

Small said Santilli and a third-party trustee have asked Carman for records detailing any prospective agreement he might have with a lawyer he wishes to hire, as well as his own financial records to see if he has other assets. Carman has refused to provide any financial information.

During the hearing Tuesday, Small said, Carman informed Eagan that he did not want to make financial disclosures. So the judge ordered both sides to file briefs on the matter by Aug. 14 before he decides whether Santilli can ask about Carman’s finances.

Eagan set a trial on Carman’s motion, which also asks that Santilli be removed as trustee of the Nathan Carman Family Trust, for Sept. 6, according to Small.

He said he told Eagan during Tuesday’s hearing that Santilli believes Carman already has “a substantial amount of money’’ at his disposal to hire a lawyer.

Carman couldn’t be reached for comment Wednesday.

Santilli and her siblings are suing Carman in New Hampshire in an effort to block him from collecting millions from Chakalos’s $44 million estate.

Chakalos was found shot to death in his Connecticut home in 2013.

Carman, 24, was the last person to see Chakalos alive and had bought a gun that was the same caliber as the weapon used in the slaying, according to court records. The murder weapon hasn’t been found. Police have labeled Carman a person of interest in the slaying, but he hasn’t been charged and adamantly denies killing his grandfather.

Carman has faced additional scrutiny for his mother’s disappearance.

In September 2016, Carman and his mother, Linda Carman, set sail from Point Judith, R.I., for a fishing trip on his 31-foot aluminum boat, which sank during the trip. He was rescued a week later, but his mother hasn’t been found.

In a separate lawsuit pending in Rhode Island, where Nathan Carman is represented by counsel, the boat’s insurer alleges he made suspicious alterations to the vessel before he set out with his mother, with the intention of sinking it. He’s denied intentionally harming his mother.

With Linda Carman presumed dead, her share of Chakalos’s estate would eventually go to Nathan, her only child, unless Carman’s aunts succeed in their New Hampshire lawsuit.

Small reiterated on Wednesday that if his clients win their New Hampshire suit, they’ve pledged to donate any funds withheld from Carman to charity.

“That’s blood money,’’ Small said. “Nathan wants it. The family does not.’’

Travis Andersen can be reached at travis.andersen@globe.com. Follow him on Twitter @TAGlobe.