His mother died last February — and now she’s gone.

When Ferdinando Delfini visited mom Elisabeth’s grave at Woodlawn Cemetery in The Bronx, he was shocked to find that the urn with her ashes was not in her burial niche.

“How do we, as a family, reconcile this?” asked Delfini, 60, who said he plans to sue. “My nieces and nephew have no place to visit their grandmother.”

“It’s really disturbing,” said the family’s lawyer, Susan Karten.

“Every family wants their loved one to rest in peace. Every family wants to be able to pay their respects. They took that away from the Delfini family.”

A spokesman for the cemetery said officials there had “engaged in what we thought was a productive dialogue about this issue” with the family, until it got a letter from the lawyer.