Did Charles Manson Have a Long-Lost Grandson?

Jason Freeman is likely accustomed to that question. A 41-year-old oil rig worker and father of three from Florida, Freeman has long believed he is the mass murderer’s grandson, born in 1976 to Charles Manson, Jr.

Freeman tells PEOPLE he first learned about his purported infamous family history as a teen. In recent years, before Manson’s death Sunday at 83, he had pushed to have a relationship with the one of the most reviled figures in United States history.

Freeman says he has talked to Manson by phone from prison for years, but PEOPLE was unable to verify his claims, and California corrections officials would not comment on the matter.

During one conversation, says Freeman, “He kept asking me what I wanted. ‘What do you want from me?’ I said, ‘I just want to get to know my grandfather.”

Freeman, who is working on a documentary tentatively entitled, Manson’s Bloodline, produced multiple birth and death documents he says prove his heritage, though PEOPLE was unable to independently verify their authenticity.

Manson was the mastermind behind the two-day murder spree in August 1969, when Manson and his followers, known as “the Manson family,” were responsible for the murders of seven people, including 26-year-old actress Sharon Tate.

Freeman, however, claims that Manson told him he never ordered his followers to kill. He describes the man whose name has become synonymous with evil as a “loving, compassionate man,” saying Manson cared deeply about the environment.

“He said his hands are clean,” says Freeman, who has retained an attorney to petition authorities for control of Manson’s estate and is pushing for Manson to have what he describes as a “proper burial.”

“He specifically said he did not kill Sharon Tate or anybody in that house. He would never hurt a human with a baby inside of them.”

Those familiar with the facts of the case disagree.

“I don’t care if you have the most powerful microscope in the world, you couldn’t find any good in Charles Manson,” former Manson Family prosecutor Stephen Kay tells PEOPLE. “He had control over his family members and they would do whatever he directed them to do.”

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Freeman, who says Willis is his grandmother, once asked her about Manson before she died of lung cancer in 2009. But “she made it known it was the last thing she wanted to talk about,” Freeman says.

Charles Manson Jr., who later changed his name to Jay White, committed suicide in 1993.

Manson Jr., says Freeman, was a “major victim in this whole story” and he was tormented by his family name before his death.

Remarkably, several people over the years have claimed to be descendants of the cult leader.

“The best way I can put it is just about anything is possible, but in most cases it doesn’t seem probable,” biographer Guinn tells PEOPLE.

Most recently, Matthew Roberts claimed his birth mother told him that Manson was his father after he was conceived in an orgy in San Francisco in 1967.

But according to Guinn, most Manson relatives have purposely kept away from the limelight and played down any association with him.

While researching his book, Guinn says he spoke to Manson’s sister and cousin. He says he didn’t use their last names because “they had both spent their lives trying not to be known as relatives of Manson.”