"If Omer's his son, he's his son," Jermaine Jackson told Britain's the Daily Mail. "We won't deny it. We are going to give him the same love and care that we give Prince and Paris and Blanket. I can't clearly say if he is Michael's, but I saw this kid around him."
Jermaine Jackson said Jackson's eldest sister Rebbie seated Bhatti up front next to the family.
"My sister went and got him during the service and got him to sit closer to my mother," Jermaine Jackson said.
Since the memorial service, Bhatti has remained in Los Angeles and been seen playing at the Jackson family compound with Michael Jackson's three children -- Prince, Paris and Prince II -- according to the Daily Mail.
Stacy Brown, a Jackson biographer who once worked as a family spokesman, said he first began hearing about Bhatti in 1992, when he would have been 8.
"He would tell them [the Jackson family] that he was Michael's son," Brown said. "The fact is, he is not Michael's son."
And no, his mother's name is not Billie Jean, the title of Jackson's pop hit in which he famously sang, "The kid is not my son."
Bhatti's mother, Pia, worked as Michael Jackson's first nanny, taking care of Prince, according to Brown. His father, Biz, reportedly worked as one of Jackson's drivers.
Following Jackson's death on June 25, Pia told a reporter: "He was the King of Pop. But for us he was so much more."
Since then, the parents, who returned to Oslo, have refused to answer reporters' questions about Bhatti's parentage.
"Maybe Michael loved him like a son, treated him like a son, and maybe he [Bhatti] felt like Michael was really his father," said Stuart Backerman, a former family spokesman. "But I just don't buy that he's his son."
Backerman believes if Bhatti really were Jackson's son, Jackson long ago would have acknowledged it, especially in light of how close he was to his three children.
In 2004, Us Weekly reported that Jackson did, indeed, acknowledge that he was the father. A source told the magazine: "Jackson has told his closest associates Omer's mom's was a Norwegian with whom he had a one-night stand."
An ex-Jackson associate who requested anonymity told ABCNews.com he remembered Bhatti from his days at Neverland.
"He was this kid who fawned over Michael Jackson on a trip overseas, so he became one of Michael's 'little friends,'" the former associate said. "When Michael met a new friend the parents often come along. His parents worked at Neverland for a while. It wasn't Michael's kid. This elaborate 'Billie Jean' scenario is ridiculous. Don't you think he would turn up in the will?"
Bhatti became a Jackson impersonator. Now he's an aspiring rapper who goes by the stage name O-Bee.
"Nobody called him Omer, they called him Michael J.," said Brown. "Ever since he was a little boy he would make himself up to look like Michael. They would wear the same -- hat, pants, shoes, even socks. Michael loved it."