Relatives of people who were allegedly murdered by James “Whitey” Bulger met with federal prosecutors today to discuss an upcoming plea agreement by Bulger’s girlfriend, Catherine Greig, who was his companion during his 16 years on the lam. Emerging from the hour-long meeting at the federal courthouse in Boston, Tom Donahue and Steve Davis said they had been told that Greig planned to plead guilty Wednesday to conspiracy to harbor a fugitive and two other charges. They said prosecutors told them that, given Greig’s history, she could serve 32 months in prison. They also said that prosecutors had told them that Greig would not be forced to testify. Federal prosecutors issued a statement declining to comment.