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March 21, 2015 11:45 AM

His lifelong secret now out in the open, Bruce Jenner faces different reactions to his transition from his famous family. Subscribe now for instant access to all the details on the divided Kardashians and Jenners, only in PEOPLE.

While Bruce Jenner continues to transition from male to female, the reality star’s three sons are “fully on board” with his life-changing decision.

“The brothers just want to be there for their dad and to support him,” a source close to the Jenners tells PEOPLE of Burt, 36, Brandon, 33, and Brody, 31.

“They own the situation, and they aren’t shy about talking about it.”

Which says a lot about how close Jenner has become with the boys given their past “rocky relationship.”

“It was extremely hard for them to let Bruce back into their lives after barely having any contact with him after he married Kris,” says the source.

“They can’t believe that they finally got their relationship back on track, and now they have this crazy extra layer to deal with, but they love him and are cool.”

While Jenner’s transition may have come as a surprise to many people, the source adds that simply wasn’t the case for Brody and Brandon – who have known about the possibility of it happening for years.

For much more on how Bruce Jenner’s family is handling his transgender journey, pick up this week’s issue of PEOPLE, on newsstands now

Behind PEOPLE’s Cover: Bruce Jenner’s Family Divided

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