Jackson Brothers Defend Michael

Dec. 18 -- Police mocked and bruised a "very fragile" Michael Jackson when the pop star was booked last month on child molestation allegations, his brother Jermaine told ABCNEWS' Barbara Walters.

Watch the full interview Friday night on 20/20

"For someone to turn himself in willingly, you should not have put handcuffs on him. And to handcuff him from the back, it was really bad," Jermaine Jackson, 49, said in an exclusive interview airing Friday night at 10 p.m. on 20/20.

"He's very fragile, so they bruised certain body parts," Jermaine said. "He had to use the restroom. And then they had mentioned they had locked him in there, and said, 'How does it smell in there?' And it wasn't too clean at all. They were making fun." Authorities in Santa Barbara, Calif., have denied mistreating the pop star.

The eldest Jackson brother, Jackie, joined Jermaine Jackson, who has been outspoken in his defense of Michael, in speaking with Walters on Michael's legal problems. Jermaine and Jackie Jackson also discussed their childhood in the spotlight and what made the 45-year-old Michael the way he is today.

Walters also spoke with Jackie's two children, Brandy, 21, and 27-year-old Sigmund, who rapped a song he wrote about his uncle Michael's legal plight.

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As Jermaine has done repeatedly in the press, Jackie maintains the allegations that Michael sexually abused a then-12-year-old boy are unfounded.

"I've raised Michael," said Jackie, 52. "I changed his diapers when he was little. … I know my brother. Michael, he's not that kind of person. He doesn't do that. That's all a lie on him."

The brothers say Michael is doing well in spite of the intense media scrutiny.

"He's holding up very, very well. He's holding up well, he knows he has the support of his family. And he's very strong," Jermaine told Walters, adding, "Strong in the sense of mental-ness, but not physically. I mean he's 120 pounds. I mean you can blow at him and break him. But at the same time, he's very strong mentally."