SEEKING ANSWERS: Nathan Carman is seen in a U.S. Coast Guard boat yesterday morning at the Boston Coast Guard base.
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A Vermont man who was a suspect in his grandfather’s killing and whose mother disappeared at sea under mysterious circumstances is set to receive $7?million, according to a published report.

However, Nathan Carman’s aunts have filed suit in New Hampshire Probate Court to keep him from claiming his mother’s share of the family fortune, which according to the filings stands at $28 million.

Carman’s grandfather, John Chakalos, who owned nursing homes, left his four daughters almost $44 million. However, according to the most recent filings, taxes and legal fees have eroded the value of the estate to less than $29 million, the Hartford Courant reported.

According to Chakalos’ will, the money was supposed to be divided evenly between his children.

Last September, Linda Carman, Nathan’s mother, vanished during a Sept. 17 fishing trip with her son, leaving him as her sole heir. He was found floating on a raft by a Chinese freighter about a week later, 100 miles off Martha’s Vineyard.

Now Chakalos’ other three daughters — Valerie Santilli, Elaine Chakalos and Charlene Gallagher — want the court to blame Carman for his grandfather’s unsolved death.

Chakalos was shot three times and killed in December 2013, according to authorities. Nathan Carman was a suspect in that case, and authorities believe he was the last person to see his grandfather alive.

The women are also pointing fingers at Nathan, 23, as the possible killer of his 54-year-old mother, aboard his boat, “Chicken Pox.”

“The facts uncovered to date warrant a finding that Nathan killed his grandfather,” the lawsuit states. “On information and belief, Nathan put on one of the boat’s life jackets; he never gave one to his mother. He deployed and entered the Chicken Pox’s sole life raft, with his bag of provisions. He left his mother behind.”

No criminal charges have been filed against Carman.

Carman is due back in court Monday to argue that insurance company should pay him $85,000 for his sunken boat.