The A&E reality series chronicling the late Michael Jackson's brothers Jackie, Tito, Jermaine and Marlon doesn't premiere until Dec. 13, but got a sneak peek of the first episode.

In their quest to reunite for a concert tour, Jermaine and his brothers break down into tears over the demise of their first musical group, the Jackson 5. (Watch the clip above.)

"I never wanted to hurt you all," Jermaine says through tears when recounting why he didn't sign the contract to join his fellow brothers -- sans Michael -- at a CBS label back in 1975, which essentially caused the group to break up.

"I never wanted to be separated," he continues. "And then Joe started treating me, like, 'Well, how you going to eat? How you going to do this?'"

Jermaine adds that if they went to CBS, producers would "make you like the Beatles," something he didn't want because they were "the Jackson 5!"

"It's loyalty -- it's being loyal to where we started," he says.

While Jackie and Tito cry, Marlon tells Jermaine they never realized his inner conflict.

"We never knew any of that stuff happened," Marlon says. "You have a right to make your own choices. We as brothers will always be brothers. I don't give a damn what kind of contract, what's this or what's that ... we will always be brothers and that will never change."

The Jacksons: A Family Dynasty will air its season premiere on Dec. 13.